Honeywell Evohome multi zone thermostat system overview

An overview of the entire Evohome system and the various options you can build into your Honeywell Evohome multi zone thermostat connected system. I show you how to use most of the options including the app and third party apps that work with Evohome. How to add local single zone thermostats to give local override options. I personally love this system and hope you find this walkthrough useful.
latest firmware update video here:
• Honeywell Evohome firm...
Starter pack with 3 TRV's, plus WiFi controller
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pack of 4 TRV's: UK: amzn.to/2ntw8fj
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Lyric T6R single zone thermostat y2u.be/tHoT_e28kCs
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[@alansmith2197]

I fitted my Evohome system about 3 years ago and it's absolutely fantastic! My system consists of a Combi boiler for heating and DHW with the Evohome Opentherm Bridge. I have 9 Evohome TRVs on 8 zones (my lounge has 2 radiators) in a 4 bedroom house. I've never had any problems with my setup and my gas bills are extraordinarily low. I reckon another couple of years and the kit will have paid for itself. I've done careful measurements, and every zone is within 0.5*C of its set temperature, and my batteries last 2 years. Geofencing and app features also work great. If I moved house, I would take the system with me because I've kept all the wax TRVs, so it would be a quick swap. You have to be aware that if you want ultimate accuracy, the doors between different zones need to be kept closed. That's no problem for me as I live on my own! By the way, Opentherm controls the boiler so it's no longer on full-blast, or off. It controls the gas more like a tap so gives a reduced flow when just heating one radiator.

[@dineshhirani2336]

How are you Geofencing with the evohome

[@alansmith2197]

@@dineshhirani2336 Hi. I no longer use the Geofencing feature as it used the additional app IFTTT which I deleted when it became a subscription model. In my circumstances it wasn't worth the additional monthly fee. After 2 years I still think the Evohome system is there best for controlling Central heating. I've had no issues whatsoever. This really is a "fit and forget" system for someone who's at home most days. I've since switched off "local control" at the main controller, because I realised my cleaning lady accidentally changed temperatures as she was dusting the radiators 😂

[@russellthomas9391]

You will also need a boiler that has a very low minimum output to run one radiator efficiently Too many people go for high out put boilers or have older combis that may only have a min output of 10-12kw when one radiator prob only requires perhaps 1.5kw/h

[@jamesilott6009]

Probably the best video about Evohome on KZbin. Definitely found this a great help especially the parts about separate temperature sensors which our plumber didn't tell us about. Even the part about how a normal TRV works. They don't teach you stuff like this at school.

[@alanrossreviews]

thanks, it was a learning curve for me too so i wanted to share, its a great system, really happy with it. Even better if your boiler supports opentherm.

[@MINERAL-115]

This was very informative, thank you. We're working on replacing our Nest system with an Evohome system, and this was invaluable in understanding how it works.

[@alanrossreviews]

Thanks. I love my evohome, if you can soak up the cost the flexibility and what you can add later is fantastic.

[@maxmerton]

It does tell you what's calling for heat, in the System Status screen.

[@alanrossreviews]

It does now, but that feature was not available when i did the review

[@supermanbatman7445]

It does the job. Excellent product.

[@alanrossreviews]

Yes it does!

[@raghudevarajan]

Hi. My display panel is beeping and says internal battery low Put in 2 new alkaline aa batteries and still same error message Also says please plug it back on power. Despite connecting it back to wall socket 😊

[@elliskarim]

Thanks for a very informative review of the Evohome system.

[@alanrossreviews]

Your welcome, thanks for watching :)

[@007Ivory007]

Video and the sticker from fujiyama mama are great! Thanks.

[@alanrossreviews]

the sticker???

[@avtarchana609]

Thanks very much for the Evohome explanation. I was looking for a system would allow the traditional 1-zone system with multiple rooms and radiators to multi zone system without having to reinstall individual zones for each room. Well, I knew it could be done with a 'smart' TRV which would have 2-way comms with a central control system (and not relying on a single central thermostat) but I did not know which system could do this. I am much the wiser having gone through your explanation of the Evohome system. Although I will look at other reviews as well but your's the first good one. Next, need to find out if there are other such systems around and if they can cater for 'room presence' detector which can take away a lot of heating schedule programming or just to override the system. Thanks.

[@alanrossreviews]

thanks. yes there are other systems to choose from and using connected smart apps you can expand on the systems own capability.

[@janoudesluysify]

Thanks for the informative review, my native language being Dutch (not double) your explaination was clear for me, thanks

[@alanrossreviews]

haha! thanks for the feedback!

[@janoudesluysify]

May I ask if the HCF82 room tempature sensor can regulate one room without using a a wireless radiatorknob? Thanks in advance

[@alanrossreviews]

when you say regulate? The HCF82 can be set to give the temperature for any number of wireless TRVs. TYhis is done from with the evohome controller and pairing the hcf82 with 1 or more TRVs. You can even still have a zone with remote control via the t87rf and the temperature read from the hcf82 and still have control from the main controller too.

[@janoudesluysify]

Thanks dor the info Alan..

[@janoudesluysify]

For.....

[@unlock-er]

Interested in getting the underfloor heating module. Does anyone know if it's wireless or wired? Thanks

[@bradya]

Thanks for the review very informative. Have you had any components fail since installation? How long is your system installed now (Dec 2019) ? how would you rate reliability? Thinking of getting this installed but it’s ££££ so wondering RE reliability

[@alanrossreviews]

3 years now and had one trv go faulty, thats it. been faultless otherwise.

[@Zindjan1]

are these valves noisy when opening and closing? I am asking because I once bought a valve that works on the same way. (it cost me £30) and it was very noisy especially at night.

[@alanrossreviews]

there is some noise ye.

[@ferroviari1435]

Great video! I am thinking about installing Evohome at home (ATC + 10 TRV) and I'd like to integrate this system into a domotic ecosystem as Home Assistant. Do you know if both are compatible? Thanks!!1

[@stoneage8810]

thanks for the video..... it looks like the Evohome controller in the video is not wireless, so it cannot be mounted on the wall directly correct ? And if i have 4 rooms, 3 rooms are using floor heating, bathroom is using radiator, so best option is to get a Evohome radiator controller for the bathroom, the other 3 rooms can work with the main Evohome controller and additional two wireless single zone thermostat ?

[@stoneage8810]

and of course need also the honeywell master controller next to the boiler i suppose

[@rinyneefs4619]

Thanx Alan, great review ! well explained ! love the boop behind you too !

[@alanrossreviews]

yeah i keep meaning to hang her but never got round to it :) btw that was just the unboxing, review coming soon! 😂

[@rinyneefs4619]

Hahaha, ok !

[@dmitrypovolotsky7229]

Thank you, great review. I have a question - is it possible to use TRVs only on some radiators in the house? I'd like to have some specific zones controlled by TRVs and "Other" zone controlled by main valve. So that if TRV zone wants heat - main valve and TRV is open and if "Other" wants heat only main is open.

[@alanrossreviews]

not sure what you mean by main valve. if you leave the trv off a rad then that rad will only come on when one of the other trvs calls for heat. like how a bypass rad would work.

[@dmitrypovolotsky7229]

@@alanrossreviews I have district heating, so in 1 zone setup, evohome controls main valve of it. Basically, you can see it as a boiler. So my idea was to put TRVs only on some specific radiators where I want fine control, and all the rest will be controlled as one single "Other" zone without TRVs. It will mean that this zone will be on when at least one TRV is on, but that's ok for me.

[@rickh1634]

Pros and cons with Evohome really. I’ve had a TRV go after a couple of years and it’s a £60 replacement so wipes out a lot of saving if it’s out of warranty so could be a very expensive timebomb. I have 14 TRVs but there are only 12 zones, not sure why (I got around it by adding two standalone thermostats). The system has had very little development from Honeywell over the years, same with the app which is a shame - it seems very dated now; there is a home security system alongside but it’s anything but secure. That said, it does what it says it does and every room is controllable assuming the doors are shut. I run it on rechargeable AAs and they last anything from a month to maybe six but a lot cheaper than non-rechargeables. Overall, dated due to poor development, left behind by newer systems, could be very expensive if TRVs drop out regularly but when working it does what it sets out to do. I forget to mention - it works with Alexa.

[@alanrossreviews]

you should be grouping the trvs into zones, it shoudnt be one zone per thermostat. you should use some standalone thermostat like the T87 as the main temperature reading for a zone of more than one rad.

[@varshaadesai8237]

Hi Alan, I am considering purchasing the Evohome system and your video and all of the reviews have been so very helpful. I think I understand it but then again this is a learning curve for me. Can I ask - I am in a 2 storey large house with 5 radiators on ground floor and 4 radiators on first floor. Could i install just 2 trv's (one downstairs and one upstairs) to control the temperature by floor? I spend most of my time on ground floor. Please & many thanks

[@alanrossreviews]

yes, you would need to setup two zones, upstairs and downstairs, then assign one of the trvs as the temperature readout. you still need a trv on all radiators though otherwise when one zone is calling for heat any radiator without a trv will be giving out heat.

[@antsworld8742]

Thank you for this video. At some point, around min 10, you mention that the temperature is read by the rtv and by the thermostat, positioned in different spots of the room, and they will balance temperature. I can only place the thermostat in a cold room in the basement. Is there a way I can setup to isolate the thermostat sensor and only take temperature from the rtv?

[@alanrossreviews]

yes i think you may have misunderstood. each zone takes its reading from a specified temperature reading. It can be a trv OR the controller itself, but not both. You can also get standalone sensors to place anywhere in a room for that purpose.

[@antsworld8742]

@@alanrossreviews thank you for explaining. So if i have 3 thermostats, one in basement and 2 rooms, can i place main control panel in basement and 2 thermostats upstairs in the rooms? Can i tell the system not to consider the main control panel downstairs (since i have no heating there) and only measure temperatures in the rooms? Thanks for your help

[@alanrossreviews]

@@antsworld8742 right. in the settings when setting up each zone it will ask what the temperature sensor is for that zone . you will of course set the trv as the sensor.

[@zadintuvas1]

Thanks for the informative review.

[@alanrossreviews]

Thanks for the feedback, appreciated.

[@gazdkw82]

Do the trvs without the digital display last longer between battery changes? Also, is there mu h feedback on energy used prior and post converting to this multi zone? My fear is that all the zones will be aiming to reach temp at different times and then the boiler is constantly running

[@alanrossreviews]

this will be down to how you set it. but even so they should all be at temperature at same time. the thermostat learns how much heat it takes to raise the temp in a zone so over time it can maintain that temperature with short bursts of heat. it works on a cycle and knows how much heat to give each zone per cycle. you will need well specd radiators if you set different temperatures for each room to make sure each zone has enough heat on its own per zone.

[@gazdkw82]

@@alanrossreviews OK great, what we're the other temp sensors you could place within a zone so I'm not reliant on the trv temp sensors alone ?

[@alanrossreviews]

they have a few thermostats that can double as temp sensor and zone control. have a look on the honeywell site.

[@hunniemaxandtheirhumantoo3351]

Can the evohome control the water boiler as well, I have a baxi back boiler and hot water storage tank if that helps any lol

[@wildbritainfilms]

Thanks Alan, informative. I have a question. Surely the Evohome wireless TRV is sensing the temperature right next to the rad - just a couple of inches away where it's much hotter, not in the main part of the room. Doesn't this create a situation whereby you have to compensate for the room's air being slightly cooler than that being sensed by the wireless TRV?

[@alanrossreviews]

thats how most trvs work. you can set an offset to compensate. however you can also use stalone temperature sensors and themostats elsewhere in the room and set them as the temperature sensor for that zone, thats what i do.

[@deutschesmaedchen]

@@alanrossreviews hi, which stand alone temperature sensors would you recommend for that purpose? What would work with evohome?

[@Alikalkandelen]

@@deutschesmaedchen Hi I'm setting up a system in my house as well so did you find a good standalone sensor that works with evohome?

[@markus4979]

Great Demo and Insight on using the Honeywell Evohome. Have you compared this with the Heat Genius System? Another interesting new system is from eCozy that only controls radiators though.

[@alanrossreviews]

for me the evohome has the most options to grow as much as you want. The only thing it is missing is weather monitoring and the motion sensor though not sure how useful that would be in practice. I dont like the heat genius thermostat either. With the evohome i can place the easy to use y87 thermostat in every room i want local control and still use their standalone temperature sesnsors to sense the temperature from exactly where i want. I can overcome with the lack of geolocation with the ifttt app. The evohome trv is easy to use as a standalone trv not sure about the genius but the evohome display on the trv is superior with more info. Also much easier turning a dial then using the up down buttons on the genius.

[@benjaminancion8785]

Really nice and informative video ! Thanks. I was wondering , when you said that the product didn't show when a valve was calling for heat : Wouldn't it be the different colors? Red = calling, orange = Maintaining reached temperature etc...?

[@alanrossreviews]

no that just relates to the temperature you have set. For example the room may be at 20, but if set it to be at 26 the screen will turn red simply to indicate a hot temperature has been set. There is no indication of what valve is calling for heat, if any. Red is hot temperature, orange cool and green low.

[@Eric76]

Could that be solved with a firmware update to the thermostat. If the EvoHome has what you called Opentherm, surely it can receive updates like this?

[@alanrossreviews]

oh yeah for sure, but that would have to want to do that, no sign so far.

[@Eric76]

Just changing the subject a bit here, is this EvoHome smart heating system from Honeywell compatible with older combination boilers such as a Vaillant Turbomax boiler? My knowledge of the current generation of smart thermostats are that the likes of Nest or Tado are compatible, but the newer V Smart from Vaillant are only compatible with their own Ecotec condensing boilers.

[@mohcin81]

Great technical knowledge mate great little system but don’t like the idea of Wi-Fi and batteries do you know if there is a hard wired version anyone?

[@alanrossreviews]

but its a wireless system by nature, it has to communicate with all those wireless devices. the controller itself does not use batteries though, it sits in a hard wired stand.

[@emozley]

Great video - I am having my system drained soon and I thought it would be a good time to introduce TRV's. As it is quite expensive is it possible to fit just the valve bodies while the system is drained and then I can buy one or two of the things with the bit you twist to adjust the temperature each month and fit them without having to drain the system each time? Thanks!

[@alanrossreviews]

As long as you fit the valve bodies you can then fit the TRV's without any of the other evohome hardware or software. It works as a standalone TRV, just a very accurate one. When you fit the evohome TRV make sure it is unbound, so it is not trying to communicate with the main controller. Then just twist the top dial for the temperature you want and it will keep the room to that setting.

[@alanrossreviews]

kzbin.info/www/bejne/rIncYWWbZaaXa5Y

[@olliet7739]

I have a question: My conservatory was fitted to the kitchen some 10 years ago (former owner) and is very draughty and cold. The kitchen only has a small radiator in it and would really only get to a comfortable temperature if i was cooking and had the electric oil radiator on as well. Should i bother putting a thermostat on that radiator because it wouldn't really make a difference, I think it would be calling for heat all day even though it's not possible to reach temperature?

[@alanrossreviews]

no leave that with no trv, it would be what they call by pass. it would only come on when other radiators are calling for heat.

[@lukaslukas417]

When replacing the TRV, do i need to remove the binding from the old one and then rebind the new trv?

[@alanrossreviews]

yup!

[@alleyoopsy]

Fantastic review, thanks very much

[@alanrossreviews]

Thanks for the feedback, appreciated :)

[@farinhanunes]

great video, thanks for sharing

[@alanrossreviews]

thank you :)

[@farinhanunes]

alan ross also, there’s a section of the video when you talk about smart water temperature control, what was that functionality called again? Thanks!

[@alanrossreviews]

er, not sure, you mean to control a hot water cyclinder? evohome Hot Water Kit The Hot Water kit consisting of a wireless cylinder thermostat, transceiver, unvented cylinder insertion sensor and an additional wireless relay box for control of the hot water zone valve. OpenTherm control for both heating and hot water can be achieved using the optional OpenTherm bridge.

[@farinhanunes]

alan ross thanks for the quick reply! Yes, OpenTherm that’s what I was looking for. I’m thinking about getting a new combi boiler and might as well try to find one with OpenTherm functionality. Cheers!

[@sygad1]

Thanks for a very informative video. Could you confirm that it controls the hot water as well as the central heating. Cheers

[@alanrossreviews]

hot water for a seperate tank yes, hot water on a combi, no.

[@sygad1]

Cheers for that. This might represent a problem, I have an Vaillant EcoTect Pro 28 combi boiler, is there an additional module for hot water in my situation, unfortunately the Honeywell site is not that great for finding answers such as this.

[@alanrossreviews]

what kind of control are you after? a pre heat function or temp adjustment?

[@sygad1]

I used to have a Hive system (old house, terrible app and ugly wall thermostat), it controlled the hot water and central heating, ideally i'm looking to replace this with the added functionality of zoned heating, 8 rooms with a total of 12 radiators. I assume the Hive just switched on the hot water with the central heating, I didn't set any schedule or temperatures specifically for the hot water, only the heating

[@alanrossreviews]

so not sure what you mean by hot water control. You will set the water temp on the boiler. The boiler itself will switch between hot water or central heating when you turn on a tap. As you said you had no schedule for the hot water (pre heat which would interfere with the central heating anyway).

[@JustinHarveyvivivi]

Is there any way to be alerted if a maximum temperature of a zone or thermostat is reached? Hive currently have this option but maybe I've missed it with Evohome. Essentially, this alerts the user if a house/room is too hot or too cold, thank you

[@alanrossreviews]

not directly, maybe a third party app?

[@JustinHarveyvivivi]

@@alanrossreviews I've checked and cannot find anything which seems quite bizarre - I thought this would have been a basic option, this is particularly useful in summer, thanks

[@nickmoreton3122]

Awesome review thanks - just have one question - sorry if it is a stupid one! I have this system installed in my home. All the downstairs rads have the Honeywell TRV,s connected and they work great. Scheduling all good. However my upstairs have old style manual TRV,s. The one thing I was wanting to do was schedule the actual boiler via this system so that it stops the boiler all together at times. I can switch of the boiler using the override on the app but cant seem to find away to schedule it - any thoughts? Or is it meant to be connected at all times and just running to the Rad calls?

[@alanrossreviews]

Nick Moreton if you want to schedule an off time just set all zones to 5 degrees for that time. I think thats what you meant? The boiler should be off if no zones are calling for heat. The old trvs cant call for heat.

[@eugenbvro]

Thanks for the video. Watched this before I got mine. Q: What is the meaning of the two squares icon, top left next to the Outside temp? I couldn't find anything about that.

[@alanrossreviews]

to be honest i just thought it was a symbol with no real meaning other than the system was in operation. The manual does not include that icon in list of icons and what they mean. They even omit that icon on some of their images on their website.

[@eugenbvro]

It seems that it indicates if the unit is connected to a wifi router (internet). I disconnected mine and the symbol disappeared. Strange that they missed this...

[@stephenholt4670]

Is it possible to buy the thermostat only initially, and then add the radiator valves later?

[@alanrossreviews]

yes it basically becomes a single zone system that way with the controller being the temperature sensor.

[@stephenholt4670]

Great, thanks.

[@77youdoc]

hi Alan, how to do you bind the TRV to the control unit?

[@alanrossreviews]

put both the trv and control unit into binding mode

[@77youdoc]

@@alanrossreviews Thank you so much!

[@realabzhussain]

one of the more decent reviews of evohome on youtube. do honeywell provide firmware upgrades do you know?

[@alanrossreviews]

other than the app im not aware of anything that has the ability for a firmware upgrade, not the hardware or the controller itself, it has no version number that I can find.

[@ian3422]

How do I connect a the remote thermostat y87rf to 2 trvs in the same zone

[@alanrossreviews]

By binding the trvs to that thermostat

[@ian3422]

@@alanrossreviews so how do I do that? I have not recieved any instructions with the thermostat.

[@alanrossreviews]

download the manuals online.

[@djreddy666]

Now thats a mullet people! :-)

[@alanrossreviews]

thank you 😜

[@RickyLee53]

Good video. I currently have a Solus system with lightwave TRV's and I'm looking to upgrade to this. How loud are the TRV's? The Lightwave ones would wake you up during the night should they change position. The batteries don't last long either.

[@alanrossreviews]

im told the batteries on these should last 3 years but since ive not had the system long I couldn't say, however the batteries are a doddle to change so not a problem. Yes they are somewhat noisy, not loud enough to wake me, its like a low pitched whine, so more than a background noise but not annoying. Might try a video in if it get time.

[@RickyLee53]

Thanks for the reply. I purchased the whole setup earlier so I'll see how it goes. The only thing I need is an UFH controller. Do you have any knowledge on this? I have 2 zones, so I think I need the controller. 2 thermostats, and 2 actuators. Its hard to find information on the specifics.

[@alanrossreviews]

sorry i have not had any reason to look into the underfloor heating side of the system. However i believe what you need is the HCC80R UFH controller to integrate the uf elements into the main system. All the best anyway.

[@7tom1ja]

Hi, thank for the video, what would I need just to get the boiler temperature on the main controler ?

[@alanrossreviews]

do you mean the water temperature in the heating system? not sure what you mean by boiler temperature?

[@7tom1ja]

I mean the hot water tank for washing,.. also do we now still need the gateway to control the system with phone or google home ?Thanks

[@alanrossreviews]

yes it can control dhw. you need the main controller and the boiler control. they come together.

[@carpscene8640]

Dude I’m interested in getting the Evo System. I do have one concern however, and that is how noisy the trv’s are when they actuate. Are they noisy? I have a young son and don’t want to be waking him up when the radiator comes on in the night!

[@alanrossreviews]

well depends on what you call noisey, they are certainly obvious when they open and close, loud enough to wake a child? debatable but possible i guess.

[@carpscene8640]

I’d love to see one in action, I’ve seen another brand being reviewed on KZbin and the trv was very noisy. Thanks for your reply mate

[@daveys]

We have them in the bedrooms and they don’t wake my two kids up, or me and the wife. Yes, you can hear them actuate but they’re not that noisy.

[@carpscene8640]

Awesome, thanks Dave 👍🏻

[@r4plez]

Imagine the number of batteries that needs to be replaced in this system :(

[@alanrossreviews]

its not a big deal, just flip off the lid of a thermostat, take out, put in, close lid.

[@jimprior180762]

@@alanrossreviews Am I right in thinking best to use proper batteries, not rechargeable? How long roughly do you get out of each set of batteries? I suppose TRVs in rooms that change temperature a lot will use more juice and require changing more regularly?

[@kennethsmyth]

@@jimprior180762 best type are long life lithium aa like used in nest smoke alarms

[@3-4-3football3]

I have installed a number of these now. Easy to install on the rads. The problem is when it comes to wiring a system with a water cylinder. You don’t need a valve. You then just rely on a TRV. When the hot water comes on it sends water to the cylinder and to the radiators. If the trv runs out of power and is open in the summer. When the hot water comes on it sends round that radiator. All these reviews are for a basic systems not the more complex ones they don’t supply diagrams for!! I would avoid this system!!

[@alanrossreviews]

or just replace the batteries in the trv?

[@3-4-3football3]

alan ross what about if they can’t? We have used all the equipment in this video on a project. With a stored water system ie s plan you don’t have a valve for the radiator circuit. If you do put one in the relays work against each other. Technical have a full time job with these systems.

[@dph9885]

You have 2 x two-port valves for an S-Plan; one for HW, one for CH. With evohome, this means installing a BDR relay for the CH valve which comes with the *ATP921* starter pack. If you additionally want to control HW, you install an *additional* BDR relay for the HW valve, which comes part of the *ATFx00DHW* hot water kit. Even without evohome, if you had no valve for the CH, the CH would come on every time the cylinder stat called for heat. Possibly you're talking about a Y-plan? In which case yes, there is only one mid-position valve for both CH and HW. There are however accommodated in the evohome installers' guide; p43. www.honeywelluk.com/Documents/All/pdf/Sundial-S-Plan-Reference-Guide.pdf www.honeywelluk.com/Documents/All/pdf/Sundial-Y-Plan-Reference-Guide.pdf www.honeywelluk.com/Documents/All/pdf/evohome%20Connected%20Installation.pdf www.screwfix.com/p/honeywell-evohome-hot-water-kit/8406h

[@maxmerton]

19 to 24 degrees is a 5 degree spread, not 6 degrees. Similarly, 19 to 21 is 2 degrees, not 3.

[@alanrossreviews]

wow, 19,20,21,22,23,24=6 options, 19,20,21,=3 options. hopefully you can carry on your life now 😂

[@maxmerton]

@@alanrossreviews I'm not sure why you're being sarcastic, especially when you're utterly wrong. It's very simple - you said 19-24 is a "spread of six degrees", and that's wrong. If it were right, 19-20 degrees would be a spread of 1 degree, and it isn't. 18.5 to 24.5 is six degrees. If you don't understand this then you don't understand the product that you're reviewing.

[@alanrossreviews]

@@maxmerton i could not explain it any simpler so not much more i can say. ok one more try, 19-24, you say it a 5 degree spread. bit it contains 6 different degrees. 19 = 1, 20 = 2, 21 = 3, 22 = 4, 23 = 5, 24 = 6. If you still find that hard to grasp im sorry but there is not much hope left :)

[@maxmerton]

@@alanrossreviews You don't have to "try". I'm a heating engineer. I grasp everything to do with heating. It's you who isn't understanding that "a degree" is a measurement, not a numeral. 24 - 19 = 5. That's a five degree spread. 24.5 - 18.5 is a six degree spread. What's particularly interesting isn't your obstinacy in accepting that you're wrong, but the fact that you encourage comments and then belittle people for making them. If you don't want mistakes pointed out, then don't make them. And if you don't to hear the truth, then don't enable commenting.

[@alanrossreviews]

@@maxmerton lol! talk about over complicating the simple! i have a degree in mathematics which seems quite ironic somehow :)

[@cozonacpufos]

10:38 that's totally wrong, the evohome can handle up to 12 heating zones not 12 individual radiators.In 1 zone you can put how many HR92 TRV's you want.

[@alanrossreviews]

yeah i should have said zones, but what i was trying to put over is that you cant have more than 12 trvs controlled by the main controller, so if each trv is a zone thats 12 radiators as a maximum. But it did confuse the point. More than 12 trvs then some have to be bound to another temperature sensor. Sorry.

[@deanofakesie8153]

Don't look like it can control dhw, shame !

[@3-4-3football3]

Zzzz could get the point quicker!!

[@alanrossreviews]

whats the fun in that?

[@tanyamoore5769]

This video was like getting teeth pulled too much ummms Andy took too long to make simple points

[@alanrossreviews]

i found this comment far more excruciating! whose Andy?

[@jimprior180762]

@@alanrossreviews I think your explanations and talking manner were absolutely fine, relaxed, informative and really good review, thanks for taking the time to do it.