Pressure Reducer, & tankless: Expansion Tank?

Unknown

to have one put in . Pressure reducers usually do not let water flow through them backwards , so a good buildup of pressure will kick the relief valve open . Hey Phil , is this the job you were talking about a few weeks ago ?

Patchogue Phil_21

Pressure Reducer, & tankless: Expansion Tank?

Gonna put a whole house pressure reducing valve on M.I.L. house (street pressure is more than 125 psi). The gas fired boiler has a 4 gpm tankless coil in it.

Does this require an expansion tank?

What size?

There will be about 8 feet of 1/2" copper from the whole house reducer to the tankless coil.

Phil

ed wallace

expansion tank

yes it does if you have a backflo preventer

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John Abbott

Expansion tank

For tankless coils we use a watts 150A water hammer arrester it is plenty big enough for the small volume contained in a tankless coil.

John

Patchogue Phil_21

Yep

Same job, Ron. I knew/know that with a water heater tank you need an expansion tank. I just wasn't so sure for a tankless coil.

Phil

Patchogue Phil_21

hammer arrester

Thanks John, for that tip. Do you have a favorite whole house pressure reducer? (Someone had recommended one a few weeks ago, but I mismember and cannot find that thread here. I didn't mark it.)

John Abbott

Reducing valve

> Thanks John, for that tip. Do you have a

> favorite whole house pressure reducer? (Someone

> had recommended one a few weeks ago, but I

> mismember and cannot find that thread here. I

> didn't mark it.)

John Abbott

Reducing valve

I use the Watts U5B

John

Ray Landry

Just make sure you use a potable water expansion tank...

FYI: every water heater doesn't need a tank, only homes with PRV's, like stated above, the act like check vavles and don't allow expansion back into the street water line

Unknown

I was just talking to a

serviceman buddy of mine and he told me they keep going back on new boiler installs with a coil . The domestic relief valves keep popping , even on the highest setting . I don't know if each home had a backflow preventer or a pressure reducer . Would those little white Amtrol Mini-trols work good for a coil and excess pressure ?