How do you fix the shower so that when the toilet is flushed you do not lose cold water and get burned. My house is only 10 years old. I just bought it.
Please help.
Prestonjn

 

The only solution is to replace the shower valve with a pressure compensating valve. These have been required in new construction since about '95 or '96.

 

http://www.deltafaucet.com/aboutdelta/scald_guard.html

 

DUNBAR,

Correct me if I'm wrong (I've been wrong before!!), but Scald Gard's simply limit the amount of hot water the valve will allow to flow though the valve. They mix in some cold water. (I tried your Delta link, and it didn't respond on my computer -- but that's just a problem with my computer.) But if the cold water pressure suddenly drops, they don't adjust for it.

Pressure compensated valves adjust themselves when the cold water suddenly slows or ceases to flow. I have 2 of them in my master bath shower. If I'm in the shower and the wife flushes the toilet (or visa versa), I don't feel any temperature change in the shower water. The cold water pressure drops, and the valve lowers the hot water pressure to compensate for it. The temp. of the water coming out of the shower head remains constant.

 

Both temperature and pressure balance valves works the same way, only difference is with a pressure balance valve you can control the water flow, where as temp valves you have one set flow of water.