Better to calculate the size required based on the rooms and the construction of the property.
There is no guarantee that the old ones were the correct size, and any changes since original installation such as adding insulation, different windows and so on will have made the sizing invalid anyway.
There is no guarantee that the old ones were the correct size, and any changes since original installation such as adding insulation, different windows and so on will have made the sizing invalid anyway.
This would be your best bet, pick the closest size and arrangement to the existing.
Layout 1 (stelrad.com)
Layout 1 (stelrad.com)
Thanks.
I've concluded that to just assume a number halfway between the output of a P+ and a K2 will be close enough as the 20mm fins on the old models have been increased to 30mm on the new ones. Gives an answer within engineering accuracy, given all the other uncertainties in the calcs.
I've concluded that to just assume a number halfway between the output of a P+ and a K2 will be close enough as the 20mm fins on the old models have been increased to 30mm on the new ones. Gives an answer within engineering accuracy, given all the other uncertainties in the calcs.