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Many mistakenly believe that an efficient radiator is a hot radiator - and that is not quite true. A radiator that performs and functions optimally must be warm at the top (where the water flows into the radiator) and cold at the bottom (where the water leaves the radiator) When your radiator feels like this, you are sure that it is performing optimally and has given off as much heat to the room, as was in the water that entered the radiator. The colder or cooler the return water is, the better you have used the energy and got optimal heat for your money.
The size of the radiator can have a big impact on how the cooling takes place across the radiator. If the installed radiator is too small, it does not provide enough in relation to the heating needs of the room and will therefore run continuously. The radiator valve will be fully open because the radiator is trying to heat the room to the desired room temperature. In that case, where you do not have a preset valve installed, the water will basically run straight through the radiator without giving off significant heat. This gives both incredibly poor cooling and will cost you on the heating bill.
Presetting is one of the most important methods for achieving the right cooling on the radiator in most homes. A preset valve reduces the amount of water that flows through the radiator. The slower the water flows, the longer the water has to release heat to the room before it is sent back to the heating system to be reheated. If the water runs too slowly, it can result in insufficient heat. Therefore, the preset must always be made based on the heating system you use, (district heating, heat pump, gas boiler, etc.) the radiator’s performance and the radiator must be the right size to cover the room’s heating needs.
If the radiator is too large in relation to the room’s heating needs, the water will have more time to release as much heat as it can to the room and will thus provide better cooling. The disadvantage of the unnecessarily large radiator is that a circulation loss occurs in the heating system, which can result in insufficient heat.
A radiator should therefore be a maximum of 150-300W larger than the room’s heating needs.
