AquaBalance Combi Boiler / Water Heater Installed

[@jonathanvelazquez4876]

Thank you so much for sharing all the information and the parts. it really makes things easier. I am installing the same boiler in two weeks.

[@nickmcgarvey6463]

I am in Idaho and having a HELL of a time finding anyone who deals gear like this. Even my mechanical contractor has been basically stonewalled by dealers when trying to get me the system I want.

[@flamingrobin5957]

QUESTION: WHY DID YOU CHOOSE THIS BRAND AND THIS MODEL, do you have any advise, regrets, or opinions about other good combi boilers or cautions?

[@PH-xt9wq]

Beautiful installation! I am in the process of completing the same installation and was wondering if you tried hooking up the additional circulator to electrical item #32 of the wiring diagram that seems to permits additional circulators (see pp 49 & 54 of boiler manual). As per the wiring diagram, circuits #9 & #10 are hot and neutral, and #11 is ground. I am using Taco pump (0015-MSF-IFC). If you don't mind me asking, is this something you tried and it failed or something you missed. The reason why I ask is I am using low water cutoff switch (LWCO switch Taco LTA-2), which is item #370 on the wiring diagram. The wiring is provided for a LWCO switch. So it seems to me that the boiler can accommodate both a secondary circulator and also a LWCO switch, as per the wiring diagram. Lastly, per code here, I must also plumb in a high temp switch. Any info would be greatly appreciated. Thanks, and once again, beautiful install!

[@Petah30]

Nice video. Thanks for making it

[@ivancastro7654]

I would like to see where the circulation pump you have for you heater thanks

[@mr.handyman6232]

Very great video. I salute your work

[@SRautio1]

Nice clean install I see you were working on the same project as me at roughly the same time. I still need to connect my domestic hot water section up bit so far nice and toasty.

[@gsp064]

Amazing set up....!!! We got WMB-155C apx 2 year back, so far very happy with performance. Family of 4 with kids using unlimited hot water. We don't have the sediment separator for water coming back from the radiators. Recently, after cold wave I am hearing a thumping noise every time after hot water demand. Is it a concern ? Also, can you make a video how to drain the radiators and flush the boiler ?

[@justinbright]

Thanks appreciate it. Thumping noise in your system just sounds like water hammer issue -- maybe you just need a water hammer arrestor on the hot water line? My sediment separator actually doesn't actually capture that much in my system, guessing it's pretty clean especially since it's a closed system.

[@gsp064]

@@justinbright The technician inspected the situation, immediately he pointed out loose cover was the reason. The air pump inside is supposed to take air from air pipe, but if the cover is loose, it wiggles. He kept some insulation on edge and tightened the screws, that stopped. Thanks for your advise.

[@justinbright]

@@gsp064 Awesome thanks for letting me know, I'll know what to do should it happen in my system.

[@davids970]

Mixing valve? Circ pump for return? Is it needed?

[@ML-lg4ky]

Nice job guy!

[@siriboss]

Hi great video, would you be able to share a list of parts for the whole install. Very nice and clean! Im trying to install one like this at my house - i have the boiler but having a hard time identifying the other components. Thanks

[@justinbright]

Added to the description.

[@gerrycoffey1]

Why do you need primary and secondary loop if you only have one zone?

[@neoblue456]

Hi how is water supplied to the boiler

[@Issa82]

Do you install in nj

[@futurestrading7673]

Do you know how to perform yearly maintenance on the unit? I’m looking to perform it myself as the plumber wanted $500 to service it!! I understand there is an associated maintenance kit that needs to be purchased also. Thx.

[@randypowell4799]

Justin, how was your CO2 & CO checked out when first start? Like to know what to expect. Thanks

[@lorenzoascali5839]

After one year the unit clogged up with calcium deposits. The installer says it’s due to bad water quality in my Township. How do I solve this problem.

[@DaleFamily3291]

. A typical - system removes calcium and magnesium ions from hard and replaces them with sodium ions. ... Gradually, most of the sodium ions are released into the household , and the resin becomes saturated with calcium and magnesium ions. AKA buy a water softener.

[@HK-zx8pu]

You suppose to clean the system annually to clean the calcium, check some you tube on how to do it, also water softer and filter is a plus

[@mixerinc]

Very Clean - thanks for posting. Do you know if there is a need for an external circulation pump if you use just the boiler function on the combi unit Weil-McLain AquaBalance™ WMB-80C - 73K BTU? I know there is an internal 3 speed pump included. We wired in a external circ pump but it runs constantly which makes it hot. It appears to be using the same line voltage terminals from the internal pump which I figured would turn off at some point.

[@justinbright]

I believe you need to wire the external pump to a relay so they can work independently of one another, you shouldn't have the external pump running constantly. I would contact Weil-McLain to get confirmation on this as I'm no expert.

[@mixerinc]

@@justinbright Thanks - will do

[@Issa82]

How it’s this boiler holding up? I was thinking of getting this or rinnai combi, any thoughts?

[@Kosova99]

I have a same unit and I was wondering if you know why my heat exchanger is leaking water and I had an HVAC person come out to look at it and he said that once the heat exchanger is no longer good the whole boiler needs to be changed and it’s asking a lot of money I called the company and They said that heat exchanger it has at least 10 years warranty but HVAC has to call them to see if they can get any credit issue towers the part. Do you have any idea why the heat exchanger failed?

[@justinbright]

I have no idea, that would be a question for WM or your HVAC contractor.

[@JustMe-pq4hy]

I have the same unit and mine is leaking also. Its leaking from the back of the heat exchanger and dripping over all of the wires and DHW plate. Its also making a loud vibration shaking noise. This thing is POC only after 4 years of having it. Did you get your leak fixed?

[@BigOTheJuiceMan]

Low hot water pressure after issue with well,please advise,ty

[@justinbright]

I really wouldn't know, have you contacted Weil-Mclain?

[@michaelbrown7202]

Do you use any circulater pump

[@justinbright]

Yes I added an external circulator pump to the system, please see my follow-up video.

[@berndwoebbe749]

The installation manual recommends 1-1/4” near boiler piping. But it looks like you used 1”. Can you explain why you went with 1” instead? I’m about to install this in my home and have everything I would need if I just went with 1” near boiler piping.

[@justinbright]

Well my system is relatively small in the townhouse, so 1" copper pipe was cheaper and easier to get, and plenty big enough for my heating demands. I verified with WM just to be sure and they told me that would be fine.

[@Johnmdarlington]

Did you not use a Thermostatic Mixing Valve? I am designing my system right now and I am just trying to draw it out and price it out, the wife is not loving the price but its way cheaper for me to do it as an HVAC professional then paying a company.

[@justinbright]

I do not have a mixing valve, just set the temp on the boiler for the DHW. I may add at some point, especially if I move and rent the house for added protection.

[@boubleskin84]

Hello how you doing? can you please explain the thermostat connection in more detail and elctrical connections 🙏 please i have the same boiler but the hot water is coming cold.

[@justinbright]

Do you have the outdoor temperature sensor wired up correctly?

[@boubleskin84]

@@justinbright thank you for getting back. No the guy who installed did not install the outdoor sensor. The DHM is not working

[@rafalrebis]

Is the build in circulating pump meant for hot water supply or heating circulation?

[@justinbright]

Heating circulation.

[@thenetwork6128]

hello, did you connect an external pump? if so where did the wire go?

[@justinbright]

I did add an external pump, and had to also add a zone relay to wire it up. I have another video that shows that.

[@Petah30]

Are you happy with your boiler? Would you buy it again? If not what unit would you chose?

[@justinbright]

I'm very happy with it, works on-demand and is much more efficient than my last oil-burning boiler while taking up practically no room since it's mounted on the wall.

[@kevindavis6105]

This combi unit doesn't require primary/secondary piping or a system circulator?

[@justinbright]

It's recommended, I actually put both in this system, see my follow-up video.

[@hanzino9174]

nice job.... how ,any zones you have there,,, ? 2?

[@justinbright]

I just have one zone.

[@MuhammadKashif-so8js]

Hi I have recently bought new house with aqua balance series 2 boiler which was installed few months ago . It works wells on heat but it does not give hot water I don’t know where is problem I saw a lot of videos on KZbin and read out manuals but in vain .can you help me . ?

[@justinbright]

Are you sure it's combi boiler?? I would consult a professional to come take a look.

[@anthonygriffin9275]

Did you need to use a water pressure reducing valve for the closed loop heating side?

[@justinbright]

Yes, I have a PRV fill valve between the air separator and expansion tank.

[@kaidodson4426]

Hey, I’m trying to install this in my home. Do you have a video where you explain it a bit more for the plumbing challenged people like myself lol. Thanks in advance Justin

[@justinbright]

Kai, unfortunately I do not. But if you have a question or problem, by all means ask away and I'll help if I can.

[@HK-zx8pu]

Usually the installation schematics comes with the installer manual, also make sure you understand primary/ secondary theory and make sure you do the cleaning once a year otherwise you will have problems with minerals stuck on the coils damaging the boiler.

[@ivancastro7654]

I need to hook up circulation pump

[@justinbright]

Go watch my other video: kzbin.info/www/bejne/mZ6XkK2Cgb2Nq8k

[@ivancastro7654]

@@justinbright thank you so much that helps a lot

[@justinbright]

My pleasure glad it helped!

[@robertdean1442]

I installed this system myself! Basically watched your video 20 times and decided to go for it! Looks great you did a good job! I’m having a problem with my unit building to much pressure and setting off the temperature and pressure valve a few times a day, have you had that happen???

[@justinbright]

No that never happened to me. Make sure the expansion tank is working properly, and you are leaving the screw top on the air separator slightly loose so air can escape, correct?

[@michaelgreer8661]

I'm in the process of installing an AB 155c. Your pressure problem might be caused by your expansion tank being too small. I'm installing an EX 90 Amtrol which has a 14.4 gal. capacity. Everything I've read says that oversizing is better than undersizing.

[@nyny5699]

I have a 13 year old Buderus GB142-45 (155k btu) unit that I would like to replace and reading specs I think this would be close replacements. I have 3-level house 800 sf each level. The current boiler connects to 3 external pumps for 3 heating zones and also has 30gal. DHW storage tank. House is in suburban NY (Westchester Cty.) Its just the 2 of us now and we always had sufficient hot water and heat. I'm not a plumber so will need an installer. Any comments and suggestions on this unit?

[@justinbright]

Install was pretty easy, you would probably want to consult a plumber to make sure it's going to work for your situation, but so far I'm pretty happy with it as it's super quiet and the DHW production is awesome.

[@Temel2005]

Hello Justin, I have the same exact boiler (installed in July). Has yours ever made a loud gurgling noise at the end of a heating cycle? Mine does it at the end of a call for domestic hot water as well as when it stops circulating heat through the house. Just wondering if you are experiencing anything like that? Thanks!

[@justinbright]

Ty, no gurgling noise in my system at the end of a heating cycle, I have no idea what that could be -- maybe air in the lines?

[@Azerplumb]

Combi should have internal expansion tank Why did you install another one?

[@justinbright]

There's an internal circulator pump, but not an internal expansion tank that I'm aware of -- couldn't find any mention of one in the manual or parts list. Manuals states you need to add appropriate sized expansion tank to the system.

[@diymadness2330]

Do you mind letting us know how much square footage you have in your house? Do you only have one zone?

[@justinbright]

1,200 sq-ft townhouse, one zone only. Might finish my basement and then add a zone for that also for another ~600 sq-ft.

[@diymadness2330]

I hope I am not being a pain in the butt. I have an ultra boiler that just broke and have been reserching putting this one in place of it since I have a 10yr old tankless hot water heater as well that I anticipate breaking soon as well. After reading the manual and comparing your install to the recommendations, did your installer forgo the recommended pipe size of the "loop" as well as having the "loop". It is hard to tell from the video if that is 3/4" pipe coming form the supply and return or more. Also hard to tell if it loops at the top by the ceiling above the expansion tank. One thing that isn't clear in the manual since it shares the same instruction manual as the no DWH version is if a circulator pump is required on the loop or if the internal pump replaces it.

[@justinbright]

No problem at all. WM recommends a primary-secondary loop, but I just went with a primary loop with one circulator (the internal one) for my install. Piping in/out is 1-inch that then branches off to 3/4-inch pipes to the radiators shortly after the air separator/expansion tank. You might try contacting WM support, they are very helpful and can clear up questions you have on your particular install.

[@diymadness2330]

Thanks for all the feedback. I guess I am going blind or the resolution on my 4k monitor is upscaling the video quality blurry but I just can't see where the primary loop meet the 2 T's just above the compression tank. If they are there, sweet, if they are not, call the installer back in!! I get the feeling that when the temps start getting really cold outside that you will be installing a small pump such as the taco 007 to your secondary since the primary loop pump is only designed for short runs with high GPM such as the taco 014. I like the fact that you put this video up since Combi Bolilers are so new to the USA and you are helping us transition to newer technology. I am not trying to judge your install only trying to help future installations. One other critique, I would move your water filter just before the t to your cold water supply manifold to the house so all your water is filtered not just the hot water.

[@zachvolvov70]

Can you add a parts list

[@justinbright]

Added.

[@craigosborn513]

Is there no external circulator pump?

[@justinbright]

Craig Osborn No. I contacted Weil McLain and they indicated it was recommended but not required, especially given the small size of the system. So I’m just using the internal circulator.

[@mixerinc]

@@justinbright I am only heating with the boiler portion of my ™ WMB-80C - 73K BTU an area of 14 x 20. I'm assuming this is small enough sq footage for no pump - can you confirm? Cheers

[@justinbright]

@@mixerinc You're probably fine with just the internal pump with that small of an area, but you might want to check with WM to verify.

[@northeastwildernesswalker]

Pressure reliefis supposed to be piped to the floor man

[@jonathanpaula7974]

Hi my aquabalance boile have this code f 37

[@justinbright]

From the manual: "The water pressure in the CH installation is too low."

[@catherinepalonis2491]

This boiler is a piece of junk. My unit was professionally installed and is less than two years old and I have had it serviced 5 times for no heat and or no hot water. . The service rep keeps giving us the run around and wants us to clean parts one at a time. My next service call will be to John Swann, CEO of Weil-McLain, the Attorney General, US Consumer Product Safety Commission, Better Business Bureau, local and national news stations and the company that sold it to my contractor. This product needs to be recalled and a replacement given at Weil-McLain expense.

[@sergeyg]

Did you end up finding out the cause of all the issues? I've had exactly the same experience in 2 years since installation.

[@Order-in-Chaos]

Your dirt separator is in a terrible location tee'd on a vertical. You should move it down on a horizontal location. The way you have it installed shows that you don't completely understand how dirt separation works.

[@justinbright]

Thanks for the feedback, but this one is designed to work in both horizontal or vertical positions per Caleffi - www.caleffi.com/sites/default/files/file/na10322_16.pdf. It's true I am no expert on dirt separators, I'm just following the manufacturer instructions. If you have some insights as why this is a bad location, maybe you could please share. Thanks!

[@roberthudanish7405]

the piping on the boiler isn't correct at all.

[@justinbright]

Please explain...

[@its_bob_from_accounting801]

one of the most horrible boiler designs ever ... regardless of the btu range these were not meant to handle the constant load of a house hold of more than 2 people . the domestic hot water usage causes the most damage due to the crappy tolerance each compression fitting has internally . Also the way the gas pipe and domestic water in/out gets plumbed based on the manual is prob the root cause of the damage to the internal piping . gas should be connected to the unit with a flexible whip in order to eliminate directional pull as black pipe would cause strain on the bottom plate of the boiler , domestic hot water should have stainless steel braided hoses . reason is to reduce tension pull during thermal expansion and water flow pressure . this boiler at best is for a single person living condition or for heat only.