Check with the installers as to whether there is a problem. I had a condenser boiler fitted with the main thermostat in a hallway and with thermostats on all main room radiators. It does not consume* any more gas than an older fashioned boiler I used to have and maintains the temperature very well. *Probably consumers less gas, as my bills are about the same, when gas prices have shot up.

The thermostat on the boiler itself is set at the max (75c ?), the main house thermostat at about 18c and the radiator thermostats on about 20c.

On the boiler itself there should be a thermostat that controls the temperature of the water it heats for the radiators. At this time of the year, this should be set to the max. If it is not set to a high temperature, it will I presume mean that you burn more gas, as it struggles to heat the radiators to the temperature where it makes the main house thermostat switch off.

Check the thermostat on the boiler itself to see whether it is heating the radiators to the max. If it is then, I am not sure what the problem is. If the boiler is just staying on for long periods, is there a fault ? With my boiler, it will come on for about half and hour to heat the house up to temperature and will then just come on intermittently to maintain temperature. I am able to set the temperature for different parts of the day and days of the week. So if I don't want the heating to be maintained to 18c-20c during the middle of the day, I can select a different temperature.

Hi

I would just like to query how the thermostat setting on a condensing boiler actually operates in relation to gas bills. I had a new heating system put in last September after years of having a coal fire. Having spoken with other people who had these boilers I was told that when for example, when the temperature of the house or room is showing as 20 degrees centigrade, if I turn the thermostat down to say 18C, the boiler will not naturally kick in, thus energy is not being used and there wont be any costs incurred. However, I dont think this is now correct.

The reason I say this is because I checked my gas meter reading for the first time since having the new system in place and it is shockingly higher than the estimated reading on my gas company's website. Naturally my reading will have gone up but not to the extent it has. It literally runs into many thousands. According to my online account I am in credit but the estimated reading is way down. They were advised of the meter reading a year ago, and even considering that, the reading now seems to excessive.

I'm now wondering if turning the thermostat down to say 5C instead of say 18C even when the room temperature is showing as 20C is actually saving costs. Simply just turning the thermostat LOWER than the room temperature is not saving money, is this correct? I was never advised of this by the plumbers who installed the system and documentation doesn't confirm this.