For real. Everytime I get in the shower I end up having to point the showerhead away and cower from the cold water and I could have just turned it on first?
this post was submitted on 19 Jun 2025
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The water in the pipes is still cold. Tankless heaters are endless, not instant. You still have to wait until the cold water is pushed out of the pipes, same as with a tank. Tankless heaters are still installed in the same central location as a tank and the hot water has to come from that point.
Well, there's those suicide showerheads containing the heating element...
No thanks, I'll use a toaster the old fashioned way.
This is true, but a lot of tankless sells advertise a feature that some have that recirculate the hot water so it's available without the wait.
So some people assume it's a feature all tankless have.
Most houses have a line going from the heater to the tap, not a loop, so the water just sits in the pipe waiting for pressure behind it to push it out of the tap. The cold water in the pipes can't be recirculated. I suppose you could plumb a loop through the whole house and constantly rerun the cooling water through the heater but that kind of defeats the energy savings from a tankless heater. That loop becomes a really long skinny tank that's right next to all of your taps.
In Asia these tankless heaters are in the shower room itself, when they are not turned on there's no water in the pipe (in the part after the heating element).