Hmmm! I am having a problem understanding Bob's comment in context with wrapped's point above.
As I understand wrapped's suggestion, the tankless water heater requires full flow to turn on and heat up the water. Presumably if you turn down the water to maybe half flow the heater element turns off leaving you with cold water. A recycle valve and plumbing lets you keep the water through the heater at full flow which keeps the heater on.
Bob: An anti drainback valve is basically a check valve. How does that solve the problem?
Wrapped: Do you mean the Showermiser kit from Aqua View? Could you attach some pics of your installation? Where did you tie in the return? It seems that you need to return it to the fresh water tank.
David
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