"These systems are not included in RdSAP 2005 and an alternative is selected as follows: Wood chip or wood pellet independent boiler or stove with boiler, with radiators: select independent boiler (154) with wood logs as fuel. Dry stove using pellets: use closed room heater (633) with wood logs as fuel. Stove with back boiler using pellets: select closed room heater with boiler (634) with wood logs as fuel.