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Most people set their boiler between 60 and 80°C in winter, with 65-70°C as the optimal comfort zone for the majority of setups. That's a good balance between heating your home efficiently and energy consumption. But it really depends on several factors - what's your system exactly? Do you have traditional radiators, underfloor heating, or geothermal? And is your house well insulated or do you have significant heat loss?
For traditional radiators, 65-70°C is generally enough if your piping network is in good condition. If you crank it up to 80°C or higher, you'll use more without necessarily heating better - that's just wasting energy. On the other hand, if your boiler doesn't have good pressure or your radiators aren't heating enough even at 70°C, you should check if there's a limescale buildup or air in the system rather than just turning everything up.
At night you can drop it to 55-60°C if you have programmable controls, that saves fuel. It's also important to insulate your house properly and not leave doors hanging open - good insulation will lower your set temperature way more effectively than a boiler running at full blast. There are smart thermostats that can help you optimize that automatically depending on the rooms.
Margaux1960 asker
I have standard radiators that are well maintained and my house is properly insulated, no major heat loss.
You gotta be careful not to crank it too high either - above 80°C, your boiler wears out faster and you're just using more energy without any real benefit. If you don't have a decent thermostat that regulates everything on its own, you'll end up turning it on and off constantly, which wears the thing out.
It really depends on your heating system and what kind of fuel consumption you're aiming for. For me, I set my boiler to 65°C and honestly it's perfect - the water circulates well through the radiators, no problem heating the rooms even when it's minus 5 outside, and my bill doesn't go through the roof. But you've gotta have a good room thermostat that cuts the boiler off when the house reaches the desired temperature, otherwise you're just heating for nothing.
The real question is: what kind of radiators do you have? With standard radiators, 70°C is the norm and it works well. But if you have underfloor heating or low-temperature radiators, you can easily stay at 50-55°C without any loss of efficiency. And then there's the room temperature you want - are you going for 19°C or 21°C?
One thing people often forget is that above 75°C you start using way more fuel without really getting more comfort. And your boiler wears out faster, the pipes do too. I'd say 65-70°C is the sweet spot for 90% of people, but what really matters is having automatic regulation rather than a fixed temperature.
I have standard radiators and I'm aiming for 20°C in the rooms. I don't have a room thermostat yet.
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