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I have a single handle shower faucet and a gas water heater. The shower temperature fluctuates whenever someone uses water elsewhere in the house (sink, toilet, etc). Is there an easy way to fix this?
Replace the valve with a pressure-balancing anti-scald one, which is pretty much all they sell in single handle now-a-days. Your current single handle may be a delta if it's not pressure balancing. If it's a symmons temptrol or moen positemp you may just need to replace the cartridge.