Mick and Vlad from Greenheat installed a new Keston boiler (would not have been our ideal choice, but our flue system meant that anything else would have been very disruptive) for us and thoroughly serviced our central heating system. It's early days yet, but everything is working well so far. They were on time, polite, tidy and the results look good to an untrained eye. Small difficulties were addressed with a minimum of fuss, and there were none of the usual recriminations regarding previous work done on the system. At the other end of the 'phone, Mandy at the Greenheat office seems to have things very firmly under control - a detailed schedule of works to be performed was provided and the whole process was timetabled well in advance. Overall, a very professional service. My only caveat is that the 7-year warranty does not apparently cover igniters (which were one of the main problems on our previous Keston boiler) - I should have read the small print better...