Hi, we are in process to put vaillant system boiler. We have builder who is suggesting to put in kitchen and we have bounglow and wants to put boiler with megaflow in attic. There is enough space for boiler and also for all pipes to run but builder is saying if we do not have clear space of 600mm then vaillant will not honour warranty. As it is being loft we cannot standup and repair but there is enough space for boiler and repair if needed. Does anyone guide us if it is best to put in attic or not and also does my builder correct in saying vaillant will not honor warranty.