It takes a few minutes for my tankless water heater to warm up, so we end up wasting a lot of water in our shower. Is there a way to avoid this? A friend mentioned a “comfort valve” or something? What is it and how does it work? Or is there another solution? Thx!
There are a few choices.
Easiest is go just use the toilet before your shower and turn on the shower before you use the toilet. If you time it right this wouldn't waste water.
um, the goal is to get the heater going by drawing on the hot supply, right? I've only ever seen cold supply hooked up to a toilet. So emptying and refilling the toilet tank doesn't use up the cooled water in the hot supply line. However, catching cooler shower water in a bucket and using this to manually flush the toilet doesn't waste the water. It is a lot of effort though.
It's not actually about the toilet, it's about turning on the shower earlier.
@sheeEttin got it. The point is you turn on the shower.and let.it run while using the toilet.