Reservoir: Smart electric water heater

Post by maxerickson » Sat, Nov 15, 2025, 4:26 PM UTC

swiftcoder wrote: post #49

maxerickson wrote: post #48

Earlier quoted context omitted.

It's comparing it to EV charging. I expect part of the point of the linked study is to examine readiness as more people adopt EVs. With the heavy use of direct combustion for home heating in the US, heating wouldn't be hugely interesting in that context. I consume more natural gas for heating each month in the winter than I do for hot water annually.

> It's comparing it to EV charging "Space heating" is also on the same graph, and it's nearly 1-to-1 with water heating. Which seems odd

Post by antisthenes » Sat, Nov 15, 2025, 4:32 PM UTC

therapod12 wrote: post #41

porphyra wrote: post #3

Interesting but federal tax credits for heat pump water heaters is ending next month [1]. It looks nice though. For people wondering what's up with the "150 gal virtual" capacity, it's actually a 47 gal water heater but it heats water to a really high temperature (if needed) and mixes it with a thermostatic valve to output the desired temperature. For example if cold water was 15 degrees C and you want the hot water…

They must be doing something different to get that much capacity. There’s a bunch of water heaters with mixing valves but they don’t talk about that much capacity. What worries me is, doesn’t higher temperature make your tank rust faster?

Post by porphyra » Sat, Nov 15, 2025, 5:13 PM UTC

Balgair wrote: post #47

porphyra wrote: post #3

Interesting but federal tax credits for heat pump water heaters is ending next month [1]. It looks nice though. For people wondering what's up with the "150 gal virtual" capacity, it's actually a 47 gal water heater but it heats water to a really high temperature (if needed) and mixes it with a thermostatic valve to output the desired temperature. For example if cold water was 15 degrees C and you want the hot water…

I had one of these types of water heaters in an old apartment. Thing worked kinda okay-ish? The main issue was that it was electric and if you used the hot water for really any time at all (bath, dishwasher) then it would pop the fuse from current draws and overheating. Likely this was some issue with the water heater and the electrical system of the apartment. Still, really annoying when half way through your bath,…

Post by latchkey » Sat, Nov 15, 2025, 9:42 PM UTC

p1esk wrote: post #44

etrautmann wrote: post #39

Earlier quoted context omitted.

1 sounds like a huge inefficiency?

Why?

Post by Balgair » Sat, Nov 15, 2025, 10:12 PM UTC

porphyra wrote: post #55

Balgair wrote: post #47

Earlier quoted context omitted.

I had one of these types of water heaters in an old apartment. Thing worked kinda okay-ish? The main issue was that it was electric and if you used the hot water for really any time at all (bath, dishwasher) then it would pop the fuse from current draws and overheating. Likely this was some issue with the water heater and the electrical system of the apartment. Still, really annoying when half way through your bath,…

Sounds like you're using a totally different type of water heater (tankless) and not a heat pump water heater (which has a tank, so even if the fuse pops, the water won't get cold instantly).