Need to boost pressure

I have a shower setup with multiple heads. I can run any two heads ok, but when I open the third, the pressure drops to an unaceptable level. The piping is all new 3/4" copper, and the supply from the street is 1-1/4" copper. There is no restriction anywhere, other than a short piece of 3/4" copper from the meter to the 1-1/4" feed to the house.

Is there a electric booster pump available for situations like this? If so, would it be installed close to the feed to the house, or closer to the shower? before or after the water heater.

There really are no problems elswhere in the house, just not enough for the three shower heads, and I do like my partys in the shower Only two heads is not option.

pressure

The problem is most likely that the valve itself cannot deliver the amount of water you need, regardless of the pipe sizes feeding it. The openings inside the valve are MUCH smaller than your feed lines, and thus have a finite volume capacity.

Please post address and phone number....Al Gore needs to have a SERIOUS talk with you!

hj said:

The problem is most likely that the valve itself cannot deliver the amount of water you need, regardless of the pipe sizes feeding it. The openings inside the valve are MUCH smaller than your feed lines, and thus have a finite volume capacity.

Click to expand...

Thanks hj

Moen 3600 valves, one for each head are 3/4" in/out. fed through a moen 3371 exect temp mixing valve 3/4" in/out. I doubt the valves are the problem. Perhaps the mixing valve is not up to feeding three heads.

I guess the way to tell would be to put a pressure guage on a hose bib and record the pressure reading with 1 then 2, then 3 heads operating.

In the case of a drop in pressure being the problem, is there a solution you can reccomend?

valve

The IN and OUT sizes are relative. The important thing is the actual size of the internal ports. If you examine the average 3/4" valve you will see that the ports are two quarter circle arcs, and much less than a quarter of a 3/4" circle.

hj said:

The IN and OUT sizes are relative. The important thing is the actual size of the internal ports. If you examine the average 3/4" valve you will see that the ports are two quarter circle arcs, and much less than a quarter of a 3/4" circle.

Click to expand...

Does this hold true for the temp mixing valve as well? Being that each head is controlled by a single volume control valve I don't think that they are the problem. However, all volume control valves are downstream from a single temp mixing valve.

valve

That is probably where the problem is, because the downsteam valves have the capacity for what you are using them for.