As households battle freezing temperatures and rising energy costs, a Reddit user has shared a 'public service announcement' advising homeowners to lower their boiler's flow temperature, rather than increase it, for greater efficiency. The post, which has garnered widespread attention, suggests that many combi boiler owners could save money by reducing the output temperature to around 55°C.
The user explained that after studying the manual for her Worcester boiler, she turned the heating knob down to between three and four, corresponding to a flow temperature of about 55 degrees. 'Most combi boilers are more efficient at lower flow temperatures,' she wrote. 'You can get more heat into your home per unit of fuel if you reduce.'
Energy expert Gordon Wallis, from UK fuel distributor Your NRG, echoed the advice. He noted that most boilers are factory-set between 70°C and 80°C, but lowering the flow temperature to around 60°C can still heat a home effectively while reducing strain on the boiler and cutting costs. 'The home will not feel colder, but it may heat up more gradually,' he said.
Wallis emphasised that the advice primarily applies to combi boilers; those with conventional tank systems should consult a qualified engineer before making adjustments. He also recommended low-cost measures such as bleeding radiators, moving furniture away from them, and fitting reflective panels to improve heat circulation.
With many households seeking ways to manage heating expenses, this simple tweak could offer modest savings without sacrificing comfort. However, experts caution that individual results may vary based on boiler age and home insulation.
