Getting hot water faucet from closed loop hydronic system?

[OptionalStop]

I'm going to be installing a closed loop radiant heat system in my new shop using a hot water tank. I'm running a water line from the house out to the shop so I can have water available at a utility sink. Is this as simple putting a tee in the line off my water heater before the circulator pump and running it to my faucet?

 

[rlitman]

No. The water in the closed loop will not be potable.

 

[OptionalStop]

So I would need to use an open system?

 

[kabinenroller]

The closed system works on pressure, if you open a faucet you will lose the pressure and the system will not work. Also, a hot water heater might have a recovery problem depending on how many feet of tubing you have, the R value of insulation and what powers the hot water heater. If you are planning electric there is a good chance it will not work, the heater will not recover fast enough.
I tried an electric tank heater in my previous building and ended up converting to a gas fired unit. My new building has excellent insulation, 1,800 feet of pex in five loops, one zone and is pushed by an on demand gas wall mounted hot water heater, it works very well. I heat the “water” to 110 degrees and keep the thermostat set at 60 degrees year round.

 

[Kaizen]

You would need a tank like an amtrol so you can run a loop through the tank. Pretty expensive though.
Probably better to get a 120 volt point of use water heater.


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[meathooker]

It’s not code compliant to run domestic off of a heating loop.

Get a little heat exchanger. It won’t be hot by any means

 

[Slowgsr]

My dad uses a hot water tank with a coil in it. Boiler water goes though the loop, heats the water in the tank.

 

[derkperk]

My dad uses a hot water tank with a coil in it. Boiler water goes though the loop, heats the water in the tank.

An indirect water heater is a totally different deal. That has 2 separate loops, heating and domestic.

Like previously said, the heating loop cannot be used for domestic hot water.


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[HoosierBuddy]

Agree with previous responses.

Besides being non-code compliant, it wouldn't be safe. Tepid water can be a breeding ground for legionella bacteria (and other nasty bugs) that can cause serious health complications if ingested or aspirated into the lungs.

Phil

 

[OptionalStop]

No problem guys, I'm going to take the suggestion of getting a separate point of use hot water heater for my utility sink. I won't need it to get real hot anyways, just enough to wash hands and use sink comfortably.

 

[86turbodsl]

Either an indirect, or a relatively largeish flat plate exchanger. You can get em on ebay cheap sometimes. Less standby cost to run the flat plate. Less performance too. How much hot water do you need?

 

[Yamaguy]

I have a 2 1/2 gallon electric water heater in my shop that supplies enough for washing hands/ cleaning up a bit. It is 120v but recovers well. It was cheap, is not as complicated as a point of use (with flow sensors Ect...), and fits under the slop sink.

 

[finn]

I have a 2 1/2 gallon electric water heater in my shop that supplies enough for washing hands/ cleaning up a bit. It is 120v but recovers well. It was cheap, is not as complicated as a point of use (with flow sensors Ect...), and fits under the slop sink.

That’s what I have. You have to manage hot water useage, but it fits under a bench, plugs into a normal wall outlet, and requires no maintenance.