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The stolen heat!
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this post was submitted on 21 Nov 2025
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How has the electricity bill changed after switching to it? I'm on the fence for getting one.
I've switched from similiar-sized apartment with a tank heater to a house with a tankless heater. My bills are close enough that it isn't super easy to tell. total it was about 20-40 more a month for the location switch.
The real difference is how often you use it. You'll save money if you use it sparingly (as opposed to an always on tank heater), but you'll definitely spend more if you don't (because infinite hot water access!). Just make sure it and it's power source is sized for the house it's going into.
You'll definitely want to pay for an electrician to get it on a dedicated circuit to power it. Otherwise you'll just get infinite tepid water instead.
I've talked to many plumbers about this and what I've learned is that if you don't have gas, it won't be as good (on average). New construction with dedicated power is a different story, but retrofits are often limited to whatever the old water heater was using, which by definition isn't enough. Running new power is likely to be a headache.
Now that you've mentioned it, I've never considered tankless water heaters being gas powered also as an option. My house is all electric so I only have that variable to deal with.
I'm an electrician. I haven't been impressed by most of the tankless systems I've hooked up. I would definitely go with gas unless you are willing to run some serious power. Most hot water tanks pull about 3000-4500W or 12.5-18.75A at 240V. A good tankless system is upwards of 18000W or 75A at 240V and some can be around 36000W which works out to 150A. This will easily be the single largest electrical load in your house, unless you also have an electric furnace or something. Depending the size of your electrical service and what else you have in your house you may need to upgrade the electrical service going to your house as well. Most Residential Electrical services are usually 100-200A in my area.
Good lord, well that puts that into perspective, thanks.
Wowza! That's a lot of power.
Yup. That's why people use smaller heating elements and slowly heat up lots of water in an insulated tank instead. Just the difference in the cost of wire you need to run is massive.