Currently I have 2 boilers: an oil boiler for CH and a small LPG multipoint for DHW. I would like to ditch the multipoint and add a heatbank to the oil boiler system to get mains pressure hot water. I'm quite happy to do all the pipework & control wiring etc. but I'm a bit confused when it comes to figuring out the output power of the oil boiler. The boiler is a Perrymatic Jetstreme Mk.II. The burner has been replaced fairly recently with a Riello G3B (rated at 19-35 KW). Looking at the adjustment of the air damper, it seems that it is set to an output power of approx. 22KW. What factors affect what the output power can be set to? Is it possible to increase the output power or will that damage the boiler? Cheers, Dave.