Instant water heater - existing hot water line in - unit's hot line out to faucet

[Chuckiechan]

So now that I know which sink starts with the hot water I will plumb that into my tankless unit and run the return back to the house...should work right?

Huh? I'm confused.

I think to get instant hot water at each outlet, you'll need an inline hwh at each outlet.

You are pushing cold, displacing hot in the inline hwh until the hot from the garage reaches the inline hwh and caused it to shut off.

Back to my example: I had 1.5 gals of cold water in my kitchen line, so I only needed a 2.5 gal hw system at the sink - enough to push hot water until the garage hwh water reached the inline hwh. The 2.5 was ~ $ 150.00 at Home Depot. This may be the way you should go.

Inline heaters are expensive and may not give you the flow you need, and most with a decent capacity are 240 volt.

[Chuckiechan]

I bought the Ariston GL 2.5 GL made by Bosch.

I hooked it up "in line", hot to faucet, cold in from hot water heater in the garage.

It works like a charm. Instant hot. It gradually drifts off a little to a little cooler as cold water mixes with the hot in the tank, but that's ok. Eventually, hot water from the outside heater takes over and it rises again.

I have it plugged into the same receptacle as my 5HP Badger garbage disposal. I have had no circuit breaker problems.

The hw heater pulls 12.5 amps @ 120V
The Badger pulls 6.9 Amps

I'd call the project a success and well worth the money ~ $ 160.00.

That is one major aggravation I don't have to live with any longer!

[jjansen28]

Hello,

I am too looking to install a 2.5 gal water heater under my kitchen sink..

I am curious how you connected the PT valve to an open drain?

I'd like to tie it into the dishwasher drain on the garbage dispposal, but I cannot install the tank high enough to get the proper slope..

[johnjh2o]

If your kitchen sink is on a outside wall you could pipe it through the wall to the outside. Don't connect it to any waste lines.

John

[jjansen28]

Unfortunatley, will not be able to cut a hole in my kitchen wall to drain the PT valve outside the house.

As many of these units have been installed under kitchen sinks, I would assume that there has to be a solution for draining them in to an existing waste line. Just like the dishwasher is drained.

Is there a reason you are saying to NOT drain into the waste line?

I have actually seen a picture on Amazon showing a bathroom vanity with a mini-heater installed. The PTV is just pointing to the bottom of the vanity!