Water Heater Handbook

Editorial Policy

How Water Heater Handbook researches, writes, fact-checks and corrects its pages, the sources it uses, the safety rules on every page and what it never claims.

Water Heater Handbook pages are written to be accurate, useful and calm, and honest about where each step and figure comes from and what a page cannot know about your heater. This page sets out how that works and where its limits are.

General information, not professional advice. Gas, 240-volt power, scalding water and a pressurised tank can hurt you. Follow the label and manual on your own heater; where they say to stop and call a qualified technician, stop. Codes and licensing rules are set locally.

How a page is made

  1. Research. We start from the makers’ own owner’s, installation and service manuals, the federal rules in the eCFR, the federal agencies’ safety pages (CPSC, CDC, EPA, PHMSA), the Department of Energy and ENERGY STAR, EIA’s energy prices and the model codes, and note what they do and do not settle and where they disagree.
  2. Writing. A draft is written from that research under the Water Heater Handbook name.
  3. Fact-check. A separate check compares each step, caution, stop point, temperature, pressure, interval, size, rating, date and code section with its source, rereads the maker’s chapter around each step for cautions further down, and reworks every sum on the page.
  4. Graphics. Any charts or diagrams repeat figures from the text and add no new facts. Every figure in a graphic shows its source and date, a step graphic shows the maker’s stop points as plainly as the steps, and drawn rating plates and serial stickers use made-up placeholders marked “example”.
  5. Final review. A last read looks for errors, gaps and anything that could lead someone into a gas, electrical, scald or pressure hazard, or mislead them about what a maker or a rule says. If it finds a serious problem, the page is fixed and reviewed again. We do not publish a page with a serious problem still open.

Each page ends with the date its sources were checked. No process catches everything, so please tell us if you find a mistake.

Our sources

Every step, interval, temperature, size, pressure, rating, rule and figure links to a primary source at the claim: the maker’s own manual, label, technical bulletin or serial number page, named with its part number and print or revision date; the federal rules in the eCFR, such as the efficiency standards in 10 CFR 430.32 and the EnergyGuide label rules in 16 CFR part 305; the Consumer Product Safety Commission, the CDC, the EPA and the Pipeline and Hazardous Materials Safety Administration on safety; the Department of Energy, including its Energy Saver pages, which are now offline and cited from the Internet Archive with their capture dates; ENERGY STAR’s own criteria; the Energy Information Administration’s prices; the IRS and the tax code; and the International Residential Code as the model code, by section and edition. Our how we check page lists the documents we use.

Plumber, heating and contractor pages, retailers’ advice pages, home-improvement magazines, comparison and “best water heater” sites, serial number decoder sites, forums and videos are never a source, not for a step, a figure, an example or a statistic. A retailer may host a maker’s own manual; we cite it as the maker’s manual, by part number, never the retailer’s text. Claims from sellers appear only as claims we have checked, without naming the seller.

Rules for every page

A wrong step on a water heater can cause a gas leak, carbon monoxide poisoning, a shock, a scald or a relief valve hazard. So every page follows these rules:

  • A clear note near the top. Every page says it is general information, not professional advice, that gas, electricity, scalding water and pressure can hurt you, that the label and manual on your own heater come first, and that codes and licensing are set locally.
  • Steps only from a maker’s document. A step reaches a page only if a maker’s own document gives it for that kind of heater. If no maker document gives a step, the page explains the part and gives no steps. We never write a step from memory, a video or a retailer’s page.
  • The maker’s stop, at the step. Where a maker says to stop and call a qualified service technician, or reserves a job for one, the page quotes that line at the step it belongs to, not only at the end. Where makers disagree about whether owners should attempt a job, the page shows each maker’s line.
  • Gas safety first. Every gas page puts what to do if you smell gas, what to do about carbon monoxide, how the heater is shut off, and what to do with a flooded heater before any step, and links our page on gas smell and carbon monoxide.
  • Power off first. Every electrical step starts with the power off at the breaker or fuse and, where the maker says so, checking that it is off.
  • Sources that disagree, side by side. Where makers or agencies give different intervals or figures, such as how often to flush a tank or check the anode, the page shows each one with its date. We never average them or quietly pick one.
  • Model codes as model codes. The International Residential Code is cited by section and edition as the model code, never as the law where you live. Licensing and permit rules are given only from a state’s own official text, otherwise pages say to ask the local building department.
  • No verdicts on your heater. Pages explain causes and checks; they never say what is wrong with a reader’s heater, that it is fine to keep using, that a job is within a reader’s skills, or that an installation meets code.
  • Estimates, shown. Calculators say “estimate”, show their working and name the method they use.
  • No referrals, no rankings. We name no plumber, gas fitter, electrician, installer or retailer as a recommendation, publish no “best” lists and pick no models. Where help matters, pages name the kinds of help: the maker’s manual and customer service, a licensed plumber or gas fitter, the gas utility, the local building department.

What we do not claim

  • We are not a plumber, a gas fitter, an electrician or a water heater maker.
  • We do not claim to have installed, repaired, tested or inspected the heaters we describe.
  • We do not invent authors, quotes, homeowner stories, test results or reader comments.
  • We do not rank or recommend makers, models, plumbers or installers, and we do not call anything “best”.
  • We give no lifespan, failure rate or savings figure without its source and the assumptions behind it, labelled as that source’s figure.
  • Photos are stock images chosen to illustrate a topic. They do not show heaters or homes we know of. A maker’s name may show on equipment in a photo; that is not a recommendation.

Fairness

Makers are neither villains nor friends. Their manuals are the best source for their own heaters, and we quote them, but they also write to protect themselves, and they don’t always agree with each other or with the federal agencies. Tank, tankless and heat pump heaters, gas and electric, each have their own trade-offs. Pages give the facts each choice depends on and do not push a reader towards one. Sometimes the honest answer is that the label on your heater, a licensed tradesperson or your building department has to answer the question.

Calculators

Our calculators are formulas with named inputs and shown working, and each formula is checked against answers worked by hand before it goes live. They use the methods, rules and prices they name, with their dates, and the numbers you enter. Every default says where it comes from, or that it is our assumption, and you can change it. Results are estimates, never a statement of what heater you need, how old yours is for certain, or what you will pay.

Updates and corrections

Manuals, federal rules, ENERGY STAR criteria and energy prices change, so pages are rechecked on the schedule set out on our how we check page, and sooner when we learn a source they rely on has changed. A page shows an updated date only when its content really changed. Errors are fixed and recorded on our corrections page.

Advertising and independence

Display advertising pays for this site, and advertisers have no say over what we publish. We use no affiliate links, accept no paid placements or maker sponsorship, sell no leads, rank no products and make no referrals to plumbers or installers. Our about page has more on how the site works.