Re: Hot Water Flow is Poor
If there is ANY galvanized steel pipe or fittings in the system (such as a nipple installed at the water heater) it may be corroded nearly to the point of completely blocking the flow of water.
Another possibility is a blocked valve. If you have any "compression stop" type valves -- the handle visibly screws in and out; they have a rubber washer that mates against a brass seat -- these typically have a much smaller orifice than the diameter of the pipe and can get plugged quite easily. If possible, replace with a full-port ball valve or a gate valve. (On a gate valve, it will take several full turns to open or close, and you won't see the handle screw in or out. A ball valve has a lever handle and is one quarter turn from on to off.)
DO NOT use a plastic valve. They are junk.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.