Calderwick Boilers, radiators and hydronic heat, written with the people who keep them running
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How Every Boiler Number Here Gets Checked

By Calderwick Editorial Desk · Published · Sourced and checked per our editorial policy

Calderwick is a publication, and hydronic heat is its whole subject: cast iron boilers, steam and hot water piping, baseboard loops, radiant slabs. Nobody producing these pages holds a trade license. (800) 555-0163 routes instead to a licensed heating contractor working near the caller.

Revenue is broken out under how we make money, and who stands behind the byline is answered separately. This page is the bar a draft clears before it goes up.

Eight places a fact here may come from

The publisher rides inside the sentence

Read a number here and the body that published it stands right there in the line. A figure with nobody's name on it is an assertion, not evidence.

Costs appear as spreads carrying the sample year, never as one average: a burner assembly swap and a full changeout with new near-boiler piping are different money. Where no credible body has published a figure, the claim comes off rather than picking up a hedge.

Code tells you what is required, not what is normal

Code text describes an obligation. A page reporting that the code calls for a given clearance, vent material or relief valve discharge arrangement is telling you what an inspector may demand, not what some fitter installed in 1968 in the cellar you are standing in. Editions land differently in every state and get amended locally, so pages name the model code and leave the rest with the authority having jurisdiction.

An output figure without a water temperature is meaningless

Hydronic ratings hold only at an assumed temperature. Baseboard is rated in BTU per hour per linear foot at an average water temperature, usually 180 degrees F in maker tables, and the same element gives far less at 140. Radiant loops run cooler still. So an output number here always arrives with the temperature it assumes attached, because BTU quoted without it sizes rooms wrong.

An American site about American boilers

Search results for boiler questions lean heavily British, and a British boiler is a different machine. Wall hung combis heating a whole house, gas engineer registration schemes, prices in pounds: none of it describes two-pipe steam in a Buffalo duplex or an oil-fired cast iron boiler in Maine.

UK guidance, regulators and product literature stay off this site, as does any article quietly translating them for American readers. The reference set is domestic: US codes, US agencies, US fuels, equipment sold and serviced here.

Gas, carbon monoxide and pressure get quoted, not reworded

Three subjects are copied, not paraphrased. On a gas odor these pages print what the fire service and the gas supplier actually tell people: get everyone outdoors, then dial 911 and the utility from there. Carbon monoxide wording tracks CDC and CPSC, symptoms included, fresh air first. Relief valve language tracks the valve maker and ASME: never plug it, never cap it, never crank it up.

Where a procedure reaches the burner, gas train, oil line or boiler wiring, the page stops and hands the reader to a licensed heating contractor. Nothing on this site is engineering, insurance or legal advice, and a web page cannot look at your system.

A model writes first, a person decides what survives

Drafting here is machine assisted, and saying so beats letting a reader work it out. What a model produces is raw material; a person then takes one checklist across it:

  1. Reopen each code and standard citation and confirm the obligation matches the sentence.
  2. Walk each figure back to whoever issued it and confirm the year.
  3. Compare every gas, carbon monoxide and pressure line against the regulator's own wording.
  4. Confirm no output number appears without the conditions it assumes.
  5. Delete whatever cannot be traced, and any line that sounds like this site turns wrenches.

The byline reads as an editorial desk because a desk assembled the page. A written process like this one does the work a fabricated credential could only imitate.

Refused outright

Every image is generated, and the file says so

Nothing here was shot on a job. Pictures are model output, and each file records that in its IPTC metadata under digital source type.

Alt attributes report only what the frame shows: a gauge reading low, a weeping circulator flange, an air vent on a steam radiator. No image is presented as a repair completed by this site, by a partner, or in a reader's home. Where a sectional drawing beats a photograph, the page runs the drawing and labels it one.

Corrections, and what makes one usable

Give the page address, the exact wording you dispute, and either the correction or the document that establishes it.

The contact page fills in the rest of the procedure; corrections themselves go to [email protected]. A verified mistake gets fixed in the paragraph it lives in, and the updated stamp moves only when the meaning changed: a standard reread against a newer edition, a rebuilt price spread, a claim pulled. Where nothing changed, the date stays put.

Talk to someone who sees these boilers every week

A boiler that quits in January does not wait for office hours. Dialing reaches a heating contractor who spends the season on hot water and steam systems: expect questions about what the gauge reads and whether the burner lights, a straight answer on what is safe to check yourself, and a price named before anything is replaced. The call costs nothing, and the estimate stays between you and that company.

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