Why This Library Exists

This site started with an ordinary annoyance: needing a service record for a boiler, finding a dozen free ones, and every single one being wrong in the same three ways.

They were laid out for US Letter, so on A4 the printer shrank them and the rows became too small to write in. They were flat images, so you could not type into them. And the columns were whatever somebody had guessed at — a date, a description, and nothing else. No space for the engineer’s registration number, which is the one detail a warranty department actually asks for.

That third problem is the interesting one.

Anyone can draw a grid

The hard part of a record sheet is not the ruling. It is knowing what belongs on it.

A boiler service record needs the engineer’s registration number, because that is what gets asked for when a warranty claim is made. A private well test needs the name of the laboratory, because a result without a lab is not evidence of anything. A chainsaw sheet needs chain pitch, gauge and drive-link count, because those three numbers are what you need to order a chain and none of them are written anywhere you will find in a hurry.

Those are not design decisions. They are the product. A generic “maintenance log” with a date column and a notes column is nearly useless, because the whole value of a record is that it captured the thing you would otherwise have to remember.

So every sheet here starts from the same question: what does someone doing this job actually have to write down, and what will they wish they had written down in three years?

The two mechanical things

Everything prints at true size on both A4 and US Letter. Every sheet is laid out inside an area that fits inside both papers, then centred on whichever one you asked for. The A4 file and the Letter file are visually identical, and neither gets scaled. This sounds like a small thing until you have printed something at 94% and tried to write in it.

Everything is also fillable. The same layout generates a version with real PDF form fields, so you can type into it and save. Several sites in this category sell that as an upgrade. It is the same file with fields on it; charging for it seemed hard to justify.

What the sheets deliberately do not tell you

You will notice they are blank in places where you might expect help. There are no manufacturer service intervals, no target values for pool chemistry, no safe limits for drinking water, and no statements about what the law requires.

That is deliberate, and it costs us traffic.

Those figures differ by model, by build year, by country and by county, and they change. A printed sheet outlives a regulation. A sheet that holds your figures stays correct for as long as you own the thing; a sheet that asserts ours goes stale and, worse, might be confidently wrong at the exact moment somebody relies on it.

So the sheets are built to hold the right answer rather than to claim it, and the pages around them point at where the right answer comes from — your handbook, your test kit, your local authority, the trade that does the work.

What happens next

The library is being built out steadily, and this blog is where that gets recorded: what was added, what turned out to be wrong, and what we learned making it. If you use one of these professionally and a column is missing, tell us — that is genuinely the fastest way this gets better.