to fit a thermostat to a baxi back boiler

HI Baxi back boiler already has a thermostat. the orange kob with the no.s 1-5 onwards to high is the thermostat! and it also has its own over heat stat. Best tip i can give. Rip it all out have a condensing high efficency boiler fitted. save 250-300 a year on gas,with room thermostat, use chimney after sweeping it for nice gas fire or wood burner! They're only 60% efficient, so save a few quid, dont throw good money after bad! regards kieran

dont understand the question