Has anyone switched from a traditional boiler to a combi boiler?
My boiler is probably now about 18 years old, runs well, serviced every year, but I think it's hideously inefficient and hate having a hot water tank and shower pump taking up room. Wondered whether to rip it all out for a new combi boiler (for efficiency) and replace the thermostat at the same time with a Nest thermostat; http://www.diy.com/departments/nest-battery-mains-powered-learning-thermostat/535515_BQ.prd?gclid=CPbzj-Dn3sMCFYLMtAod0SkAGQ&ecamp=SEAPLA535515_BQ&ef_id=VDWcxAAAARJbFKWs:20150213112449:s
I have no idea whether this is all worthwhile or not - so a serious post from me to anyone that's done this/is in the business/wouldn't recommend?
Thanks!