How do I properly adjust my gas boiler for winter 2026?

You need to have your boiler checked and serviced by a certified professional before winter, it's mandatory and it guarantees it'll run properly without risk. You need the flue swept, a combustion check and maybe the flow temperature adjusted - this isn't a DIY job, you really need someone qualified for that. How old is your boiler?

One thing people often forget: check the water pressure in your boiler (it should generally be between 1 and 1.5 bar). If it's too low, your boiler has to work harder and uses more gas, so you're basically throwing money away. You can raise it yourself using the fill valve at the bottom of the unit - no need to call a technician for that. Combined with the mandatory annual maintenance you need to do anyway, it's a simple step that can really make a difference on your bill this winter.