I have a sets unit (tankless watre heater) my hot water temp keeps going up and down due to my pressure goimg up and down. i asked the water people i they coud raise the pressure but said it was 35psi. to 45psi. The sets unit people told me that it was my pressure and i need to fixc that 1st ; but was told about a in-line pressure pump.would this work??

jlisenbe

Are you on well water or municipal water?

izzy70

on a community water well system.

jlisenbe

Do you need more pressure, or just a consistent pressure? In other words, would a consistent 40# work, or do you need 45+?

izzy70

I need a consistent pressure. it fluctuates, that the hot water gets cold then hot. Sometimes it stays where i set the shower handle at .this is the same threw out the house.
plummer told me but wouldn't clarify you need pressure or volume?? oh thanks for helping

iamgrowler

If pressure is that low and the fluctuation is that broad, then you would do better to install a pressure reducing valve set at 35psi.

As for installing a booster pump, pressure as low as yours isn't going to be helped unless you install a storage tank to draw additional volume from.

jlisenbe

I think Growler is entirely right about this. 35# seems to be a little low to me, but that might be about the best you can do. You might look into adding a booster pump with a pressure tank as you would have with a well, but be aware that you would still need the pressure valve to maintain a consistent pressure.

You more experienced guys, are you a little surprised to see 10# of pressure change in short periods of time on a municipal water system? That seems a little odd to me.

iamgrowler

The wide disparity in pressure fluctuations would be explained by other users on the already low pressure water system drawing water at the same time.

Really, his only option here is to set up a water storage system and a booster pump.

My suggestion would be two glass lined 50 gallon tanks run in series and a 50psi booster pump located in an outbuilding somewhere, far enough away from the house that the noise of the pump won't drive him to distraction.

And before I forget, you will need an atmospheric vacuum breaker installed on the inlet of the first tank in the series.

izzy70

well i looked at some booster pumps and the one i found was a flowtec — 1560 GPH, 3/4 HP, 1in., Model# FP4815

one well guy i talked to said that this should do it and it is only needed when we take showers mainly . my only other choice is to redo the whole system and put ;spot water heaters. in each bath. do i really need to put a water tank??
why wouldn't the booster pump just work by itself ??

iamgrowler

Because supply isn't going to keep up with demand.