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Discussion Starter · #1 ·
Can someone share a drawing of a installation using the following components :


1. Tankless GAS water heater. I have a RHEEM - (No Re-circ included)

2. Re-circulation pump. (Grundfos)

3. Return Line, Cold Line and Hot water line.
4. Check valve (back-flow preventer)


Please advise best way to plumb this in.



Recirculating pump i have is below :

https://ordering.fwwebb.com/woitem/...HhIwtcTfu7k-ltBBOE4C50V6xcgj-j8hoC0bwQAvD_BwE


Also, when the recircurc pump is running does the Heater come on ?
 

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Demand water heaters for recirculating systems have a small tank in them. Without a reservoir, the heater will probably run whenever the pump runs and might short cycle.
 

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Discussion Starter · #5 ·
want to revive this thread !

Any ideas on how to plumb Thankless and Recirc pump with return line ?
I'm looking for specific instructions (drawing) like how many check valves etc etc and where they go.
Rheem's instructions are super confusing.

I also found out that the flow-rate of the Recirc pump might not trigger the thankless from switching on so that might be an issue as well.

Thanks in advance.
 
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