Thanks Chris,
You may be interested to know that the Celsius 25 was installed as a replacement for a Glotec 80 condensing boiler which was installed about 15 years earlier. Unfortunately the company (Glotec) went bust about 2 years later. I managed to get replacement servicing kits from various...
I chose a Keston Celsius 25 boiler because it could be installed in a cellar with the air inlet and flue pipes routed through 50mm MUPVC waste pipe - both are about 15 metres long. I have now seen quite a few alarming reports of problems with these boilers and note that Keston have discontinued...