Water meter sizing and how it affects WH tank output
Our community is having all the water mains replaced. They are woefully undersized at 4" so they're digging up the streets and going to a 8" line.
As part of this project, they're running new service to each house in the community. They're also installing water meters. Previously no one was on a water meter here. You should also know that the community has separate water supplies for domestic vs irrigation water. The water meters are to be installed only on the domestic water supply.
The problem is, the HOA has decided in its infinite wisdom to install 3/4 inch water meters on the domestic supply. They claim that because this is for domestic water only, there should be more than adequate pressure. They are quoting a flow rate of 30 gallons per minute at 50-60 psi via an adjustable regulator.
The old 4" water line with no meter to the house had 85 psi.
Our single story ranch style house is 5 bedrooms, 4 baths with two laundry rooms. We have multiple head showers in one master and a large 120 gallon tub. If we have one or three showers going at the same time or even with a dishwasher in addition, are we going to have adequate water pressure? We will be installing two 75 gallon WH's, one on each side of the house so that each WH supplies one side of the house.
My contractor thinks that the 3/4 inch line coming in from the meter is likely too small for our needs. But the HOA maintains that it should be more than adequate and is not willing to upsize the meter for us. Thoughts?