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Sounds like an issue with your heater. Not sure why your dishwasher changes anything, they normally run off cold water and use their own heaters. Sounds more li

Sounds like an issue with your heater. Not sure why your dishwasher changes anything, they normally run off cold water and use their own heaters. Sounds more like you run your kitchen tap while filling the dishwasher, and flushes the cold water out of your pipes, and gives your heater enough time to get to temp. Have you tried see if you can set the output temperature of your heater higher? Could be the output temp of the heater is very close to “shower” temperature, and a lot of heat is lost heating up pipes etc, something that could be sped up by increasing the heaters output temp, or improving the insulation on your hot water pipes.

scottlamb 4y ago
The water's hot enough everywhere else (this bathroom's sinks after the aforementioned delay, other bathroom, kitchen). The heater's set to ~130 deg F, which iirc is the upper limit of what's recommended and considerably above the ideal shower temp. It really seems to be the dishwasher running that makes the difference. I rarely use the shower in question, but my wife does every evening, and it apparently doesn't help if I've done all the rinsing/hand-washing and loading of the dishwasher but not actually hit start. I don't understand the mechanism, but I believe her. I'm not sure if the dishwasher draws from the hot or cold tap.
jxcl 4y ago
> Not sure why your dishwasher changes anything, they normally run off cold water and use their own heaters. For North America at least, this is not true. Dishwashers are hooked up to the hot water supply[1] (and it's a good idea to run your sink tap hot to "prime" the hot water for the dishwasher). They _also_ use built in heating elements to keep the water hot, and to dry the dishes, though. [1]: LG Dishwasher Installation instructions (as an example), page 8: https://www.lg.com/us/support/products/documents/Dishwasher%20Installation%20Manual.pdf https://www.lg.com/us/support/products/documents/Dishwasher%...

scottlamb 4y ago

The water's hot enough everywhere else (this bathroom's sinks after the aforementioned delay, other bathroom, kitchen). The heater's set to ~130 deg F, which iirc is the upper limit of what's recommended and considerably above the ideal shower temp. It really seems to be the dishwasher running that makes the difference. I rarely use the shower in question, but my wife does every evening, and it apparently doesn't help if I've done all the rinsing/hand-washing and loading of the dishwasher but not actually hit start. I don't understand the mechanism, but I believe her. I'm not sure if the dishwasher draws from the hot or cold tap.

jxcl 4y ago

> Not sure why your dishwasher changes anything, they normally run off cold water and use their own heaters. For North America at least, this is not true. Dishwashers are hooked up to the hot water supply[1] (and it's a good idea to run your sink tap hot to "prime" the hot water for the dishwasher). They _also_ use built in heating elements to keep the water hot, and to dry the dishes, though. [1]: LG Dishwasher Installation instructions (as an example), page 8: https://www.lg.com/us/support/products/documents/Dishwasher%20Installation%20Manual.pdf https://www.lg.com/us/support/products/documents/Dishwasher%...