My boiler was installed 12 months (0ct 2014) ago and since installation has been nothing but problem after problem. Inspite of having a 5 year warranty I'm now on the verge of having it ripped out and replaced with a new boiler. I have the c/h set at full 85c and water now set at 50c and pressure read 1.3bar. I just ran a bath to find the water was just warm and in looking at the boiler can see the water temp rising to 41c then down to 35c. I've had 4 visits by repairers to try and sort this problem out with no joy. They did replace the safety valve (twice) and auto air vent (twice) and a faulty expansion vessel and then a thermistor. What might be causing the problem? The boiler also needs repressurising about every 2 weeks although we have replaced radiators with a little corrosion on the bleed valves we can't find anywhere else that might be leaking at all. Any advice appreciated before I take drastic steps.