Two service visits can look identical from the hallway and differ entirely on paper. The difference is measurable: a real service produces numbers, and the numbers are the proof that measuring happened. A record without readings is a receipt for a visit, not evidence of a service.
Derek Stuart Heating & Gas services boilers across Gosforth, and this is a customer's guide to the paperwork: what should be on it and what each line quietly tells you.
The combustion figures, translated
The flue gas analyser produces the service's headline numbers: the combustion ratio and related readings that show whether the boiler is burning cleanly within its manufacturer's tolerances. You do not need to interpret them like an engineer; you need to see them written down, because their presence proves the analyser went in the flue.
Gas rate matters alongside: the appliance measured actually receiving and burning the input it was designed for. Together these two say the boiler is doing its chemistry correctly, which is what efficiency and safety both rest on.
- Combustion readings prove the analyser was used.
- Gas rate proves the supply and burner match the design.
- Numbers on paper are the difference between checked and glanced.
Behind the casing
The physical half of the service inspects what drifts with age: burner and electrode condition, seals and gaskets, the heat exchanger's state, the condensate trap cleaned of its annual residue, and the flue's integrity from appliance to terminal.
Derek Stuart Heating & Gas treats the condensate trap as a fixed item on every visit because it is the cheapest breakdown prevention in the trade: a trap cleaned in autumn is a lockout that never happens in January.
- Seals, electrodes and exchanger inspected for drift.
- Condensate trap cleaned annually, not eventually.
- Flue checked along its run, not just at the boiler.
The system-side lines worth seeing
A thorough service glances beyond the appliance: system pressure where it should sit, expansion vessel charge checked so pressure stops seesawing, the magnetic filter opened and emptied of its black catch, and inhibitor level considered and topped where due.
These lines protect the boiler from the system it lives on. A filter emptied at each service is quietly collecting the evidence of how clean the water is, and its contents inform honest advice about whether a cleanse is approaching.
Reading this year against last year
The record's real power is comparison. Combustion drifting toward its tolerance edge, pressure needing more frequent topping, a filter catching more each year: trends whisper before faults shout, and a folder of annual records is the cheapest diagnostic instrument a household owns.
Keep the sheets together with the warranty and installation paperwork. Manufacturer warranties typically require documented annual servicing, so the folder is simultaneously your boiler's medical history and its insurance policy.
Related pages
Questions customers ask
What should a boiler service record actually contain?
Combustion readings, gas rate, work done including the condensate trap, system pressure, anything advised, and the engineer's details. Numbers present means measuring happened.
Why does my warranty care about servicing?
Manufacturer warranties commonly require documented annual servicing to remain valid, and a claim without service records is where households discover this. The record folder is the warranty's evidence.
Does a service include cleaning the magnetic filter?
On a serviced system with a filter fitted, it should, and the catch is worth seeing: it is a direct reading of how clean your system water is.
Ask for the numbers, keep the sheets, watch the trend. That is the entire art of being well-serviced, and it costs nothing beyond insisting.
Derek Stuart Heating & Gas services boilers in Gosforth with the readings on the record every time. The contact page books it.
