4k square ft looking to add it as a main source of heat for a lower hvac unit of a two story house. i want to add the dhw kit to it and keep 110gallons of potable hot water handy and also 1000 gallons of non potable water with exchangers. i have been heating with wood for my whole life and havent used anything like this before. anybody have one? like it? i want to buy the best brand/model available.