I install commercial heat-pumps. Downside is the initial outlay cost. As stated do a correct heat loss for the building. I’m assuming you have done that with your proposal for an 11kw?
Or call a manufacturer speak to a sales rep get them to size it up. Vaillant daikin nuheat.
Some evaporation occurs definitely some water molecules won’t need as much energy to become superheated.. and because of this the system will be saturated, a mixture of liquid and vapour.. which is latent heat and cannot be measured.
You’ve got an airlock more than likely. Best way if you still have an hot water washing machine supply valve ( probably not connected ) connect the hot and cold taps together either buy another hose or disconnect from machine. Turn them both on for about ten seconds tops.should be sorted after...
Keston is an ideal. They do the 45kw. And they are very reliable. The Atag Q series are another trust worthy boiler. Also can be range rated so if required the demand can be changed. How has your boiler been piped to the system?
The gas main might be iron and corroded and water gets in. If you have ever seen water in the gas main the ugauge goes up and down and if the leak is underneath grass. You’ll see a dead patch of grass. Also the gas is low pressure compared to water main.
If it was only the towel rad pipe work then I would say the problem is the aqua sensor is defective or has some dirt lodged inside. The outer case is part of the combustion case, this will need to be removed so its advised this should be carried out by a RGI.
Nathan
The valve will get power to close the heating port on the valve. As stated the switch live comes from the cylinder stat.
If you can use a multimeter you need to check the voltage to the cylinder stat. This will indicate if the programmer is sending the voltage for hw on and also hw off...