hot water


Old 04-07-03, 08:36 PM
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hot water

Currently I have a 40 gallon natural gas heater. The inlet pipe is 3/4 inch and the outlet (hot water supply) is 1/2 inch. Cold water supply is 3/4 inches. The pipes branch off to 1/2 inch from the main pipes to all the faucets. My home is a 1300 sq foot ranch with 2.5 baths. The water heater located ot the south corner of the house.

When some one is taking a bath and if hot water is used anywhere els in the house the water will suddenly turn cold and unless the faucet is turned off there is very little hot water goingto the shower. Will increasing the hotwater supply pipe from 1/2 inch to 3/4 inch for the main hot water pipe increase the supply of hot water throughout the house and take care of the problem of hot water "starvation"?
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Old 04-08-03, 05:52 AM
Mike Swearingen's Avatar
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Yes, it will increase the volume to replace that 1/2" to 3/4" hot water supply, but it won't increase the pressure.
There should have been 3/4" run from the water heater with no more than two fixtures on each half-inch line from it. It would be even better to run 1/2" to each fixture directly from the 3/4".
If allowed by local code, you can use CPVC, which is much easier to install.
Here is an illustrated article from Reader's Digest "The Family Handyman" magazine on installing CPVC:
Good luck!
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