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.








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