Tankless water heater with tank

[John Gayewski]

You need a check valve on your return line as well. You'll need balancing valves on each half of the return line coming from the fixtures.

 

[Joe0735]

Thanks, again. As far as the hot and cold fluctuations in the downstairs shower go, I am going to assume the problem is the balancing or mixing valve in the fixture. I have a kitchen faucet and an upstairs bath, both of which have balancing valves, and I am not experiencing the problem I am having in the downstairs shower.

 

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[John Gayewski]

Thanks, again. As far as the hot and cold fluctuations in the downstairs shower go, I am going to assume the problem is the balancing or mixing valve in the fixture. I have a kitchen faucet and an upstairs bath, both of which have balancing valves, and I am not experiencing the problem I am having in the downstairs shower.

I don't know what you mean by balancing valve. You have a two handle shower valve with an exterior pressure balancing valve? Or a one handle shower valve with internal pressure balancing valve? Usually there is a mixing chamber in a valve as opposed to an external mixing valve.

 

[Joe0735]

It is actually a Kohler, not a Bosch. Sorry. The pressure balancing valve is a plastic riveted unit with two dime-sized holes (part# GP500520). It installs inside of a recessThe mixing valve (handle. Part# GP77759) mounts on the outside if this. The two compress together during installation ans seal with o-rings.