Short answers
The questions people ask us.
Short answers to the questions we hear most. For the long version, see our guides.
Boilers and heating
Why is my boiler thumping or banging?
The usual causes are limescale, sludge in the system or low pressure, which make the water boil in pockets inside the heat exchanger. Check the pressure gauge first, as low pressure is the easiest cause to fix.
Still noisy? We find the cause before it fails. →
Last reviewed
Hot water and cylinders
What is a combi boiler?
A combi heats water straight from the mains when you open a tap, so it needs no hot water cylinder or loft tank. It suits homes where hot water is rarely wanted in several places at once.
- The full answer: Combi or system boiler — which is right for my home?
Not sure it suits your home? We survey and give a written fixed quote. →
Last reviewed
Do unvented cylinders need servicing?
Yes. Unvented cylinders hold hot water under pressure, and their safety devices should be checked every year by a competent engineer.
Due a check? Ask us to book it in. →
Last reviewed
Working with Datum
Does a heat pump need a thermal store?
A heat pump needs a hot water cylinder, and some designs add a buffer tank so it can run steadily. Whether you need one depends on the heat pump and the heating system.
- The full answer: What is a thermal store, and how does it work?
Thinking about a heat pump? We survey first and give a written fixed quote. →
Last reviewed
Why are we called Datum?
A datum is the fixed point every measurement on a job is taken from. Get it right and everything lines up, which is why we work to one fixed written price, one accountable team and one standard.
Want it done that way? Ask us for a written quote. →
Last reviewed
For businesses
How long do commercial boilers last?
Lifespan depends on the boiler type, water quality and how well it has been serviced. Repeated repairs and hard-to-find parts are signs it is nearing the end.
- The full answer: How long does a boiler last — and when should I replace mine?
Ageing plant room? Ask us for a survey and a written fixed quote. →
Last reviewed
Why do we pressure test new pipework?
We pump the system up, leave it under pressure, then come back and check the gauges. If the pressure holds, the pipework is sound before anything is covered up.
Planning new heating pipework? Ask us for a quote. →
Last reviewed
Get a real price, not a callback
A few questions, no pressure, no surprises.