Originally Posted by Joe Tilghman
Confirmed, the hot water in the sink was running before I flushed.
And to remind the washer is also affected when I flush and it is 2 ft from the water heater.
Looking back at your posts, there is some conflicting information.
..... a. In your original post, you said that 3/4" pipe was coming out of the water heater and it transitioned to 1/2" PEX about 10 feet out.
..... b. In another post you said that 1/2" pipe was coming out of your water heater.
..... I'm assuming now that in item-b you really meant item-a. Is that right?
To summarize what I understand so far:
1. All of your home, hot and cold, was re-piped in 1/2" PEX.
2. There is a 3/4" pipe coming out of the water heater which transitions to 1/2" PEX ten feet away from the water heater.
3. When you flush the toilet in the bathroom, the hot water from the bathtub faucet goes to a trickle. (Or is it only from the shower head that goes to a trickle?)
4. When you flush the toilet, the volume of hot water from the adjacent bathroom sink faucet is cut in half.
5. When you flush the toilet, the volume of hot water to the washer is cut in half.
1. Are all of your input cold water lines up to the water heater input 3/4" pipe?
2. Do you have any galvanized pipes in your system?
3. Is the cold water system also plumbed in 1/2" PEX?
If you can post a diagram of your plumbing configuration which shows what size pipes are where, "galvanized, copper or PEX" where, that would be helpful.