I changed out both elements in my electrc water back in late August. Had to change the bottom one out again today.
this post was submitted on 12 Oct 2024
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And so we come to the eventual argument. An electric water heater is going to keep a jug of water in your house hot by running off and on all day forever. Where did that electricity come from?
In my case, a mix of fossil fuel and renewable resources that on the whole are significantly less carbon-intensive per unit of energy than straight up burning methane in my house
I bet you like nuclear.
I wish we had European style water heaters at the tap. But that's not safe. You should see what I find in hospital infrastructure.
Oh I used to work at a hospital that was built in the 60s and know full well what sort of asbestos-laden Frankenstein's monster they become over time
Please stop the climate denier arguments. Even if it was a gas power plant, it would be still more efficient than your little home gas heater and this gap gets wider and wider when we add more and more renewables to the energy mix.
A lot of the electricity probably came from burning natural gas at the power plant, and then some of that (~5%) gets lost in transmission. If we assume the natural gas plant is 60% efficient at turning gas into electricity, then an electric heating element in a hot water tank at your house would be about 55% efficient.
A typical gas furnace is about 80% efficient at turning gas into hot fluid, and a good one can reach 95% efficiency.
Depending on the fuel mix of your local grid, there's a good chance that burning natural gas at home will result in less pollution than using electric resistance heaters, either for heating water or the air inside your home during winter. Places like Washington state that generate most of their electricity from hydroelectric power plants will be exceptions.
However, heat pumps can be higher than 100% efficiency. They don't use electricity to generate heat, they just move heat from one place to another. You'll produce fewer emissions overall by using an HVAC heat pump to heat your house, and a heat pump water tank for hot water. Even if you live in a place like Canada, you can reduce emissions by installing a dual-fuel system that will use electricity to run the heat pump weather permitting, and fall back to using gas when the outdoor temperature goes too far negative.
Using heat pumps to move heat from outside, to inside your house, to inside your hot water tank is more efficient than using gas to heat your home and water, even when the electricity to run the heat pump is generated by burning natural gas.
I don't own a home but if I ever do I would love to put in a heat pump and solar panels. Great detailed response.