Disclaimer

Heater Handbook publishes general information about home water heaters. It is not professional advice, and using it does not create a professional relationship. The site is not a licensed plumbing contractor, gas fitter, electrical contractor, mechanical engineer, code official, or medical provider. Laws on who may do this work vary by state and city. A homeowner exemption in one place is not a license, and it usually does not cover a rental, a gas line, or work you do for someone else.

The manual and the local code win

Heaters are listed and installed under a manufacturer’s instructions and under the code edition your jurisdiction has adopted. Those two documents outrank a general guide when they disagree. Status-light codes, manifold pressure, vent material, electrical nameplate data, and clearances are model-specific. Copying a step from a similar brand is a common way to damage a control or fail an inspection.

The International Residential Code is cited on some pages as orientation, because many U.S. cities adopt it with amendments. An amendment is often the part that matters: garage elevation, seismic straps, pan drains, combustion air, or whether a permit is required for a like-for-like replacement. The building department is the authority. A page on this site is not.

Gas, carbon monoxide, and electricity

Combustion appliances can kill people in their sleep if the vent or the combustion air is wrong. Do not block a combustion-air opening, do not extend a flue with unlisted material, and do not convert a natural-gas heater to propane unless that model has a listed conversion. If you smell gas, leave the house without using switches and call the gas utility from outside. If a carbon monoxide alarm sounds, leave and call the emergency number. Do not “air the house out” and go back to sleep.

Electric storage heaters and heat pump water heaters use high voltage. Treat the circuit as live until it has been proved dead with an appropriate tester. Resetting a breaker or a high-limit button once is a diagnostic. A second trip is a reason to stop, not a reason to hold the button in. Heat pump refrigerant circuits are not a homeowner repair. The electrical safety guide and the when to call a pro page are the practical version of this paragraph.

Scalding and health

Hot water injures children and older adults quickly. The temperature figures on this site come from the U.S. Consumer Product Safety Commission’s tap-water scald publication, and the Legionella discussion follows Centers for Disease Control and Prevention descriptions of growth in warm water. None of that is medical advice for a person in your household. If someone is immunocompromised, talk to a clinician about risk and to a plumber about a mixing valve. Do not raise a tank temperature because a web page mentioned bacteria, and do not ignore a scald hazard because a different page mentioned energy savings.

Leaks, relief valves, and “repairs” that are not repairs

A temperature-and-pressure relief valve that has been capped, plugged, or piped uphill is a dangerous heater. Do not put it back in service that way. A storage tank that is leaking from the steel shell is finished. Sealants, clamps, and tighter fittings do not restore a rusted tank wall. Shut the water and the fuel or power and replace the heater.

Money

Dollar figures are typical ranges from named publications in named years. They are not quotes, not bids, and not a prediction of your utility bill. Labor, venting, electrical upgrades, permits, and water quality move the real number. Tax credits expire. The cost guide records the federal credit cutoff rather than assuming a credit still exists.

No warranty

The pages may be incomplete or wrong for your heater. To the extent the law allows, the editorial project disclaims liability for injury, property damage, code violations, or costs that come from relying on a guide. See the terms. If you are unsure, stop and hire a licensed person. That is the intended use of the uncertain case.

Questions about this disclaimer: contact@heaterhandbook.com.