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 Control flow output of 2 different sized pipes
Author: senorpipagrande (CA)

I want to mix the output of a 3/4" tankless water heater and a 1-1/2" cold line. They will be entering into a tank water heater 1-1/2" input. The 3/4" flow should max out before the 1-1/2" starts to flow. I was hoping to use a simple valve. How can I do this? Thanks

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 Re: Control flow output of 2 different sized pipes
Author: packy

i'm sure there is a way but it won't be SIMPLE...

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 Re: Control flow output of 2 different sized pipes
Author: Paul48 (CT)

"The 3/4" flow should max out before the 1-1/2" starts to flow."

Those criteria make it impossible.

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 Re: Control flow output of 2 different sized pipes
Author: hj

There is no "simple valve" which could detect when the hot water is done so the cold water can beging. In fact, simple physics would usually dictate that the 1 1/2" flow would overpower the hot water, since the hot water would be losing pressure as it flows through the water heater.

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 Re: Control flow output of 2 different sized pipes
Author: caja715 (Non-US)

what is the application? If the tankless modulates, you might be better to temper with the tank and shoot it through the tankless warm instead.

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