Researched, not professional advice. WaterHeaterCalc publishes
calculators and buying guidance compiled from the DOE test procedures, NFPA 54 and NEC code tables,
manufacturer specifications, installation manuals and the consensus of verified owner reviews. We do not
test products in person. A water heater is a pressure vessel: the temperature and pressure relief valve is
never capped, plugged or removed, and a tank with a seized one is genuinely dangerous. Gas line work,
flue and vent work belong to a licensed plumber or gas fitter, because improper venting produces carbon
monoxide. Water at 140 F scalds a child in seconds. Turn the breaker off before touching an element, and
never energise an element that is not submerged.
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