The lilyking 677 21kw boiler stove has a built in back boiler that is capable of powering up to 10 radiators with plenty left to keep your room nice and warm as well the lilyking 677 boiler stove is full of great features such as thermostat control cool touch handles and a hi tech secondary combustion system to increase efficiency this stove offers great value and can really make a difference to your heating bill as an addition to your heating systemairwash systemdual air controlsexternal ri