DIY: Adding a PoU Water Heater Under Sink

[@oggyyears]

Is there a reason you didn't install the pressure relief valve to the cold water connection, it should have been provided with the water heater. Great video but for safe and reliable use I would consider it essential.

[@NiobiumThyme]

Isn't that tape supose to be wound counter to the threads?

[@viorelg29]

Excellent explanation. Thank you for this video!i have 2 questions ....how you drain when you don't use for a long period of time?Can you use under the sink the model over the sink and if not why? THANK YOUUU!!!

[@JoeMartinMVC]

If you wanted to drain it you’d have to remove it and pour out any water that remains inside of it. Fortunately with it being just two hoses it’s a two minute job to remove it. You could definitely use it over a sink instead of under it, you’d just have to use longer hoses to reach the respective inlet and outlets on the heater.

[@viorelg29]

Thank you very much for the answer.. I thought the same but people try to convince is not possible to use over the sink ,under the sink ...curently I own an instant water heater and I already have long hoses😊

[@JoeMartinMVC]

@@viorelg29 you’re welcome. The biggest concern would be if you had low water pressure, it could need a pump if you were going up more than a few feet, but that’s rarely an issue with the vast majority of residential construction.

[@secordpd]

I bought a cheap siphon pump at walmart. Make sure it has a 2 different size hoses as the bigger hose does not fit in cold water intake. I siphone most water out so its not so heavy then its easier to remove and finish emptying.

[@AL-bh2ws]

Does this need a pressure relieve installed somewhere?

[@Glomly]

Yea, that's super weird it doesn't have one. Kinda dangerous

[@Autonomous1969]

I've had one for over 15 years and I've got no pressure relief valve. Water expansion is taken up in the pipes but you have to make sure you have enough pipe.

[@dwaynegreen1786]

Thanks for the video. I will be ordering my tank for the kitchen this week. I’ll give an updated post after installation. Thanks for the video.

[@JoeMartinMVC]

It sure is! I’m located down in Florida. The one that I linked in the description is the newer model of the one I have and is available in the US.

[@jamesjacobs7944]

See comment from james jacobs.

[@Luxex7]

Excellent video, could you explain what you did to the electrical cord?

[@JoeMartinMVC]

Hey there, I have a second video I made showing the electrical side of the install. kzbin.info/www/bejne/pHWXhoSimdRlq9k

[@ludigracic]

There is no need for teflon tape. Just replace rubber gasket if there is a leak. My ariston is 12 years old and still seal properly.

[@michiganborn8303]

Is this product available in the U.S.? Our kitchen sink hot water wastes about 2½ - 3 gallons of water before it heats up because it's the furthest water line from the hot water tank.

[@jamesjacobs7944]

See comment from james jacobs

[@RogerPack]

tankless main water heater?

[@ufoliver1]

How does the hot water from the primary heater make its way into the PoU unit? Does that 2 mins of cold water in the line flow into the PoU and mix with the heated water in the PoU? Does that result in a Hot, Warm, Hot sandwich?

[@JoeMartinMVC]

Pretty much, yeah. As the cooler water is cycling in to the PoU unit it's heating up rather quickly, but it will definitely only be warm during that time. I rarely use up all of the hot water in the tank before it gets to the point of the warm water any way.

[@thestranger5971]

Is this large enough for a big bathtub?

[@JoeMartinMVC]

Definitely not. You'd want a full-sized water heater for a bath tub, or an instant water heater such as this: kzbin.info/www/bejne/jJ2ohGl4r7iZe6M Though you'd likely want a 10kw+ model for a bath or shower.

[@nickslife6533]

I just installed this under my sink. I tapped into the hot water supply line. Now when faucet is turned to hot the water flow is basically like a drinking fountain. Very low. Any ideas?

[@Autonomous1969]

You need to tap it into the cold water supply line.

[@Spinsella93]

can this system be installed if not connected to the mains. looking to install in a camper ?

[@JoeMartinMVC]

When you say the mains, do you mean main water lines, or main power lines? Regardless, it can be installed. Without main water lines you would need some water source to fill the tank for it to heat it up. If you mean without main electrical connections, it would just work as a small storage tank.

[@TXH1138]

How long does this type take to heat up? With it being fed by the hot water line, once the main water line is at temp does this one shut off?

[@JoeMartinMVC]

From room temp to the hottest temp it only takes around 10 minutes, so not too bad in my book. Once it reaches the temp that you set it to it turns off. So if you feed it off of the hot water line like I do, after a period of time hot water would be feeding in to the tank and it wouldn't be turning on to heat the hot water that's coming in.

[@TXH1138]

@@JoeMartinMVC I'm confused. I thought these smaller ones were supposed to be almost instant hot water. If my main tankless only takes a couple of minutes to get hot, why would I install one of these?

[@JoeMartinMVC]

@@TXH1138 it sounds like there’s just a bit of confusion as to what this product is used for. This is a point of use water heater, meaning it’s a secondary water heater at a source. In my case, at a bathroom sink, to provide hot water to this location, and that hot water is stored in the tank at the installation location. You’re thinking more of a tankless or instant water heater, which is a whole different level of beast. Those work by having a massive heat source to instantly heat up the water as it’s passing through, usually with either a gas setup that works incredibly well, or a less efficient electric heat strip version. Tankless heaters can, in theory, provide limitless hot water, where as a point of use water heater stores a set amount of gallons of water that’s hot and has to heat up new water as it goes in to the tank and takes a few minutes.

[@TXH1138]

@@JoeMartinMVC Yes I was confused. I thought that this was just a mini tankless. I have a tankless but it takes a few minutes to get to temp in my bathroom which is the farthest away. I thought this would eliminate that waste of water and provide instant hot. Thank you for the clarification.

[@jessemalott1900]

Iv got a water heater but it takes forever to get warm in the house so its ok to hook the hot water line coming from the hot water tank to the cold side of little tank?

[@JoeMartinMVC]

Yes it is. That’s how this one is plumbed in. Alternatively, if you don’t want any water from the main hot water tank to go to it, then you could tee off from the cold water line like I mentioned in the video. The main reason you’d opt to go cold water only would be to minimize power consumption from the main water heater, but either plumbing solution works.

[@B2C2007]

It would be nice to see the water pressure when the tap is in use.

[@JoeMartinMVC]

Hey, the pressure is identical in my case, so nothing to show there. There was no restriction in the flow rate.

[@relaxingandentertaining6170]

I installed upside-down and now it doesn't work what is the problem please?

[@JoeMartinMVC]

The vast majority of water heaters are not designed to be installed upside down. A lot of them have tip over sensors inside of them that stop them from working if not up-right, others also have the outlet tube toward the bottom of the tank, so it wouldn't pick up water at anything less than completely full if that's the case.

[@markmraven]

Lmao

[@jaimecontreras3926]

Did you feed the water heater with hot water hose?

[@JoeMartinMVC]

I did connect it to my hot water line already, but with the tee I mentioned in the video (and linked in the description) you could run it off of a cold water only line without an issue.

[@itsnoahonfire]

You can use a hot water source or a cold water source. Most people add it to a hot water source and use this water heater as a buffer when hot water takes a minute or two to reach the sink. That is what I plan to use mine for and supply hot water to my dishwasher.

[@davidking4712]

Where is the water pump connection on this?

[@JoeMartinMVC]

There is no pump in this scenario. The water pressure from your water lines pushes the water through. You could add a pump in at any point before or after the heater though.

[@jig1056]

So how well does it work

[@JoeMartinMVC]

Amazingly. Never have to wait for hot water at the bathroom sink now.

[@jig1056]

@@JoeMartinMVC thanks for the video and the info. I'm going to check it out over the holidays

[@amjnyc]

what temp. do you set the heater to 90?

[@jamesjacobs7944]

Must use a push through tap. If not you are literally building building a bomb that can take out brick walls. Instant hot water is wonderfull. Set temp low so that you can use only hot water at perfect temperature.

[@adammenges3535]

I didn’t even know this was a thing.

[@JoeMartinMVC]

They're pretty amazing to have for areas that don't get hot water quickly.

[@sixoh_diesel5662]

I'm probably going to get an outdoor rated one for my backyard outdoor kitchen build, I already have a spigot for cold and this will prevent me from needing to plumb a hot line all the way from the hot water heater.

[@JoeMartinMVC]

@@sixoh_diesel5662 These things are absolutely wonderful for that type of scenario. Nice and easy to install and relatively cheap overall.

[@Oneklickmedia]

@@sixoh_diesel5662I was thinking the same for my bbq sink. Next to a water source so figure this would be more ideal

[@katyd4183]

I would love to have more commentary. I really dislike the background sound.

[@mitchellbirkhead9214]

Where’s the expansion vessel and pressure relief? If that’s on mains that will blow.

[@theryanwitski]

It’s not needed with newer tankless.

[@mitchellbirkhead9214]

@@theryanwitski a pressure relief is definitely needed.

[@Ericplaytoomuch1]

lol do you see it on there??? No it’s for a reason… the machine will kick off if anything with an error code or color

[@mitchellbirkhead9214]

@@Ericplaytoomuch1 erm what hahaha. POU heaters like this don’t give you error codes.

[@mariealv4888]

Hey, that voice could be making big money,checking with Hollywood agents, send a voice simple.

[@JoeMartinMVC]

Haha, thank you. I would love to do voice acting one day.

[@jennyomalley7634]

Looks a mess , No safety relief valve , no expansion chamber ( hope there's enough pipe from stop-cock for expansion ) no restriction valve . If it's just showing a D.I.Y. botch-up OK , but NOT a how to video..🙃