20 gal. water heaters are normally 120 volt.
30 and 40 gal. water heaters are normally 240 volt.
If you upgrade, you may have to change out the breaker and wire.
40 gal. will run you close to $300.
Natural gas tankless water heater for just 1 bathroom will cost close to $700, without
installation. I just installed one in my parents house.
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