Boiler flow temperature setup for lower running costs
Most condensing boilers leave the factory at a flow temperature far higher than a typical UK home needs. Above roughly 55°C return temperature the boiler stops condensing and loses the efficiency you paid for.
Why the number matters
A condensing heat exchanger recovers latent heat by cooling flue gases below their dew point. That only happens when return water is cool enough. Drop the heating flow temperature — hot water stays unaffected on a combi — and the same boiler quietly returns better fuel figures. In poorly insulated stone properties the workable minimum is higher, so we set it against the actual house rather than a blanket figure.
What the setup includes
- Heat-loss sanity check against radiator output room by room
- Staged flow-temperature reduction with comfort verified over the visit
- Radiator balancing so the coolest rooms aren't starved
- Written settings sheet so you can revert if a cold snap needs more
Frequently asked
- Does this affect hot water?
- No. Combi hot-water temperature is a separate setting and stays where it is.
- Will old radiators cope?
- Sometimes not fully. Where a room falls short we'll price a larger radiator rather than push the whole system back up.
- Is this worth a paid visit?
- If you've never had it done, usually yes — it's a one-off job with an ongoing saving. If you're comfortable adjusting it yourself we'll happily talk you through it on the phone.
Small job, lasting effect
It takes an hour or two and needs no new equipment on most modern boilers. We'll leave the settings documented and explain how to adjust them in a hard winter.
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