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Hi Rob, thanks again for great input. Do you agree in principle with the direction I am taking in opting for a kW output just big enough to put the full amount of heat through the cyl. coil? The Vogue Max has good reviews and in a recent survey of which boilers gas engineers would install in...

Rob, thanks very much for your great help! I have arrived at the conclusion that a 26kW would be ample in allowing the boiler (Ideal Vogue MAX system) to modulate down to 5.2kW but also give me the benefit of the cylinder technology in that it will fully utilise the 24.5kW coil inside the 300L...

Thanks again Rob! I have had an engineer specify it but as I expected, he took estimations of kW outputs whereas I added up the kW of each radiator he specified and added this to the kW output given to me by the underfloor heating company that supplied me the system! His own calculations were a...

Hi Rob Thanks very much. Being new to the forum I didn't even think to post a new topic but will do so now. By account of your calcs, that would mean 14kW (for UFH, rads) + 24.5kW (coil of MegaFlow 300i) + 2.5kW (10%) = 41kW! I will struggle to find a system boiler at that size so goodness...

Hi Nigel I know this is a very old post but I am having the same issues in calculating the requirements for the water heating when the central heating needs to also be on. Can you tell me if the 18kW system boiler was fit for purpose in the end? I have spoken to various manufacturers to gain...