Tying tankless to tank version

[Hamberg]

(short lead in... had an addition build a couple years back and a Rheem ECO200 9.5 GPM tankless unit installed - addition is 1 bth, kitchen and laundry - with the anticipation of tying it into the main section at some point)

Question: what is the best practice to do so? Would it be best to run the hot side of the tankless directly into the cold side of the tank heater - thus feeding hot water into that unit or tee it into the hot side of the tank heater?

If you tee it in, does there need to be an isolator or check valve in line?

Thanks in adavance! -Bill

 

[frodo]

 

[Hamberg]

View attachment 19604

Perfect exactly how I thought it should be!!

Follow-up question; no return line, can I dispense (plumbing pun) with the check valve(s)

 

[frodo]

 

[breplum]

Dear frodo,
What graphic rendering resource are you using to present the drawing?

 

[Diehard]

My guess is he found it already made up for recirc systems.
Which leads me to the question, why are you suggesting a recirc system at all?

 

[Hamberg]

Follow-up question...

Recommendations for the best (cosmetic) way to terminate the intake/vent for this unit.

Last unit was old and used stainless witch was pretty close to 6" on center - the new uses PVC and the term kit they included is 5 5/8" OC.

I'm 3/8" to 1/2" off from making it work. I could "in-theory" chisel out some of the(poured) concrete to make it work - if I had to.