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solarCH
I would be really interested in opinions on whether it is more efficient to plan a central heating system to run at low or high temperatures.
The radiator manufacturer states heat output in W at delta 30 and delta 60 with respect to the average room temperature. The installation is a mild climate with only a few really cold days each year. I have estimates for the heatloss in each room (from the architect) so its a question of which size radiator to place in each space to replace the heat escaping. We will need more and/ or bigger radiators at D30.
D60 will obviously heatup quicker but I heard the other day that condensing boilers are more efficient at lower temperatures (that is, a D30 circuit will need the boiler to run longer at a lower temperature to raise the radiators to the required temperature but less gas will be consumed as the boiler is being more efficient??)
Each radiator will have a thermostat, and on really cold days we can increase the operating temp to heat up quicker (and replace the more rapid heat loss due the steeper temp gradient.)
Hope that all makes sense!
The radiator manufacturer states heat output in W at delta 30 and delta 60 with respect to the average room temperature. The installation is a mild climate with only a few really cold days each year. I have estimates for the heatloss in each room (from the architect) so its a question of which size radiator to place in each space to replace the heat escaping. We will need more and/ or bigger radiators at D30.
D60 will obviously heatup quicker but I heard the other day that condensing boilers are more efficient at lower temperatures (that is, a D30 circuit will need the boiler to run longer at a lower temperature to raise the radiators to the required temperature but less gas will be consumed as the boiler is being more efficient??)
Each radiator will have a thermostat, and on really cold days we can increase the operating temp to heat up quicker (and replace the more rapid heat loss due the steeper temp gradient.)
Hope that all makes sense!