Our present boiler is a Geminox 10-50, about 10 years old. I am just toying with the possibility of changing it, as I am concerned that there seems to be only one maintenance company is the SE of England that can provide maintenance.
I see that Vaillant have a 65KW Ecomax boiler in their commercial range. I have used Vaillant boilers before, and I have found them excellent. The cost is around 1800 to 2000 Pounds for the boiler, and there will be some fitting costs.
I had someone around to estimate and he recommended a Keston C55 boiler, which is a make I have never heard of. His all-in price, including fitting was what seems to me to be a ludicrous 5500 Pounds. Leaving aside the price, which I guess is negotiable, are Keston a decent brand, on a par with Vaillant?