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Frequently Asked Questions

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A condensing boiler makes more of the energy it uses by utilising heat normally expelled through the flue. By converting over 90% of the fuel used (rather than just 50% in the case of some old boilers), a condensing boiler makes your fuel go further. Therefore a condensing boiler can help to save you money and reduce your carbon footprint.
Combi is short for ‘combination’. It refers to the way this type of system serves as both a central heating boiler and a hot water heater. That means there’s no need for a water tank as hot water is provided on demand. As well as saving the space normally taken up by a water tank (in the loft or airing cupboard) a combi boiler saves on hot water costs as well as delivering hot water at mains pressure.
This typically forms part of a conventional heating system, and is linked to a series of water tanks that feed the boiler and radiators. Storing hot water is key to this system, this means there is always a plentiful supply of hot water.
Like a regular boiler this uses stored hot water. Because the water is pumped from the boiler straight to the radiators and hot water tank, it’s a faster, more economical system. The heating system is pressurised via the cold water mains and does not require a header tank in the loft. What’s more, many of the components of the system are built-in, making it easier, quicker and more affordable to install.
Yes, because they only produce hot water when needed rather than storing and heating large quantities of hot water. Modulating boilers ensure a smooth operation, fewer ignitions, greater reliability and lower fuel bills.
Your boiler should be serviced annually by a Gas Safe registered engineer in order to check that it is operating safely and at peak efficiency. Having your new gas boiler serviced annually will ensure that your manufacturer's warranty remains valid.
A boiler service will take approximately 1 hour to complete. We can visit at a time that suits you during our normal office hours.
It's a common misconception that it is cheaper to leave your hot water and heating on all the time. Although the boiler will use more power initially to heat the home and water from cold, the cost of this is greatly exceeded by the cost of keeping the boiler running 24 hours a day. The principle of an appliance using more power when it starts is quite normal - cars, ovens and kettles are the same - but we don't run these appliances 24 hours a day. Ideally the heating and hot water should not be on for more than 9 hours a day, unless it is extremely cold.
No, it's almost always cheaper to have your hot water on when you need it, as a full tank of hot water will always lose heat and need topping up by the boiler. Normally it takes around 30-45 minutes to heat a tank of hot water. Set your programmer to heat it up for a short time before you are likely to want to shower or bath in the morning and to come on again before you next want heat. There is often a button on your central heating programmer that lets you get a boost of hot water in between times.
No, if you have a gas central heating boiler use that to heat your hot water, ideally using your timer/programmer to time your space heating and your hot water heating at the same time. Only use your immersion heater as a back up.
The temperature of radiators will naturally fluctuate when controlled by TRVs. This is normal.
The boiler will only fire up when your heating and/or hot water is on and the thermostat is calling for heat. If you have a room thermostat the boiler will stop when the area covered by that thermostat reaches the temperature set on that thermostat. The boiler will then stop running until heat is again required. This will be when the temperature drops below that set by the thermostat. When this happens the room thermostat will signal the boiler to 'fire up' again, re-heating the water and pumping it to the radiators.
No, turning it up will not heat the room up quicker; it will only heat it to a higher temperature.
No, as condensation may occur in unused rooms. Also, if you just use one radiator it is not good for the heating system and it could break down. Therefore, we recommend that you set the TRVs in all the rooms to between 2 and 4 and the one in the living room to a higher setting.
Turn up the room thermostat in the hall to 18°-21°C (66°-70°F). The living room should get warmer now. Turn the TRV in your bedroom to a lower setting so that the bedroom does not get too hot.
No, as condensation may occur in these bedrooms. Instead, turn the TRVs on these radiators down to a low setting. The radiator will now only come on if the heating is on and these rooms are very cold. Close the doors of these bedrooms to prevent them from draining heat from the rest of the house, too.
When the TRV senses that the air in the room is warm enough, it closes the valve and stops hot water flowing into the radiator. When the room cools, the valve opens and hot water flows back into the radiator to heat it up.