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Fancy is great until your first service call for the unit.
Alot of tanks require a "minimum total service" to your house. usually 125A+ for what you want, althou the 12kw usually require less.
The people that complain and post reviews online about "heater not working" are people that are too cheap to install the proper size, have a family of 9 for a single tank with 3 washrooms, or DIY something stupid. Whatever your exisitng BTU is on your old tank, you want to match up. BTU/3400 = kW (15kw = approx 50kbtu)
Hire a plumber, get er done.
source: half plumber
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