How much pressure is too much?

justinae

justinae

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We had a 1" line installed from the steet to the house. We then installed a MANABLOC manifold and hooked up a pressure guage to test leaks. It's reading 85 psi. The good news is that it has held steady for several days. But is that too much pressure for the manifold and to feed all the lines. Should I install a pressure regulator?

thanks much,
Justin
 
I think it sounds like a good idea. What is an ideal pressure? House has one 1 toilet, 3 sinks, 1 tub/shower, 3 hose bibs. It's less than 1000 sq. ft.
 
The size of the house has nothing to do with ideal pressure. Excessive pressure will put a strain on toilet valves and clothes and dishwasher valves, and high pressure is not need anywhere in the home. 40 psi is about as low as you would want, 65 to 70 is more than plenty. I set my PRV and thermal expansion tank pressure at 50 psi, but I have two outside hose bibs that take off before the PRV so they have 90 psi with a 3/4" pipe, but that is way too much for inside.
 
I wouldn't bother. That's in the high-end of normal where I live.
 
If your pressure gauge doesn't have a 'tattle-tale' that shows the max reading, pick one up, then leave it attached overnight to see what happens. Often, at night, when most people aren't using water, the pressure goes up. The water company may also raise the pressure to refill water towers, so a one-time check of 85, may not represent reality.
 
really helpful stuff. so given that water pressure may spike, cost is probably less than $50, it sounds like a good "insurance" policy to me. I don't have a tattle tale pressure gauge, just a regular one.

thanks,
Justin
 
All good points. Went through the same thing with my home with regards to pressure. It had a PRV that was failing set at full output around 75-80 psig, but the home had no thermal expansion tank. When I hooked up a gauge that would show max pressure, I found it spiking to around 120 after water heater recovery from showers.. Since it had been like that for 14 years before I bought the house, I was ready to live with it. However, after putting in new toilets the pressure began spiking to 150 plus and popping the relief valve on the water heater--the old toilet fill valves had been acting as pressure relief around 120. So I went ahead and installed a small thermal expansion tank while having the PRV replaced. Runs nice and steady now.
 
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