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Frequently Asked Questions

Q. Will Gas 24 guarantee their installation?

A. Yes, definitely. We guarantee all of our new installation work. Please contact us to find out what's covered and for how long.

Q. Are there ever any deals on new heating or boiler system installs?

A. Gas 24 always try to be as competitve as possible for our quality workmanship and materials. In addition to this we do offer deals for our customers at selected times of the year. Please get in touch for more details.

Special offers on gas central heating systems at Gas 24

Typical central heating system installation layouts.

Regular vented gas boiler heating system layout

An unvented gas boiler heating system layout

Click on images for larger views.

New Boiler & Heating System Installation by Gas 24

At Gas24 we appreciate that the decision to install a new gas central heating boiler or gas central heating system, can be a costly affair. But as long as the information and guidance you receive is right, this decision can actually add value to your property and therefore reduce your costs in the long term when coupled together with a good servicing and maintenance plan.

For every pound spent on the purchase and installation of your new gas central heating and boiler system, a proportion is saved by keeping the on-going running costs to a minimum. This is achieved by making sure the new boiler and/or heating system is perfectly matched to the type of house, it's location, the existing set-up and also any future plans you may have for renovation or expansion of the property. This way there is no under or over compensation made resulting in energy loss. A strong point made by potential house buyers and their surveyors.

Why do I need an engineer to view my property before Gas 24 issues a no-obligation fixed quotation?

Basically, every house is different and every owner has different requirements on what they want from their new gas central heating or boiler system. You may have 1 bathroom or you may have 4. You may have little or no space in your loft or low mains water pressure. For these reasons it is always advisable that a competent surveyor or engineer visits the property to assess what is required. Therefore we can providing an accurate and realistic fixed quote and not just an unrealistic 'cheap central heating - one quote fits all' price that will often rise as the install progresses.

The money you spend on your new heating system is ultimately an investment and should save you money on future energy bills. This is especially important of recent as the gas supply cost spirals upward!

Gas24 can provide installations, repairs, upgrades and maintenance or servicing to any of the boiler systems listed below and can adapt any existing set up where necessary. We are also additionally qualified to supply and fit unvented hot water mains pressure systems as we are an agent for Gledhill, manufacturers of such systems.

We only fit boilers from reputable manufacturers with a proven reliability record. We do our very best to provide a great solution to fit your budget.

Underfloor Heating

An overview

Underfloor heating has become very popular in recent years, especially in new builds and renovations where the pipes or cable can be installed within the sub floor, which is by far the most efficient method.

There are basically two types of system available, a water-fed pipe coil or an electric cable system. Ideally, both systems are embedded in a concrete 'screed' sub floor so that the heat generated is stored in this quite substantial mass where it can be retained over an extended period of time. Because of this method, the water supply or indeed, the electrical current doesn't have to be as great as in a conventional central heating system to attain the same output. For example, water temperature need only be approx. 50°C instead of 60 in a water-fed/boiler setup.

With an underfloor heating system, the floor becomes the heat source, and as heat naturally rises, it makes for a much more comfortable and indeed efficient way of heating your home compared with conventional central heating systems. A regular radiator-based heating system uses convection currents to drive the heated air from the radiator upwards towards the ceiling where it then starts to cool. This cooling air continues across the ceiling and then starts to fall downward, across the floor pushing air up pass the radiator to start the cycle again. This in effect is a very lengthy, inefficient process when compared with a gentle stream of radiating heat. Not to mention a lot more dust being created via a convenction method.

Underfloor heating does have it's drawbacks though. To be at their most efficient they do really need to be installed within the concrete screed subfloor and in some cases this just isn't feasible in many lived-in homes (with exceptions) and the warm-up time can be a lot longer than other systems. But in many cases, the advantages far outweigh the negatives.

Gas 24 are installers of all water-fed underfloor heating systems and will be able to help you make an informed decision on whether to opt for this type of system.

Types of Boiler used in Heating Systems

Combination Boilers (Standard/High Efficiency)

Combination or combi boilers produce a near instant supply of hot water on tap. Unlike conventional heating and hot water systems, a combination system does not store hot water, but heats water as you use it. There is no cylinder, no tank and no connecting pipe work, which saves space and reduces hot water costs.

Some combi boilers have small internal water storage vessels combining the energy of the stored water and the gas burner to give faster hot water at the taps or increase the hot water flow-rate.

Installation cost of combination boilers are significantly lower and less space is required as water tanks and associated pipes and controls are not required.

Although combi boilers are very efficient, they do have their disadvantages. The water flow-rate is likely to be less good than from a storage cylinder, particularly in winter. The power rating needs to be matched to heating requirements; heating water 'on demand' improves energy efficiency but limits the volume of water available at any moment. The incoming water supply pressure mustn't be too low. A combination boiler has more moving parts that can break down, so can be less reliable than a tank system.

Conventional Boilers (Standard/High Efficiency)

Conventional hot water boilers or regular boilers as they are also known, use a more traditional system and layout. The heated 'primary' water from the boiler is used to heat 'secondary' water which is stored in a cylindrical tank (usually made of copper, insulated and situated in an airing cupboard) which contains potable (drinkable) water supplied from a cold water storage tank. This mains-fed cold water tank is usually situated in the property's roof or loft space and enables the heated water to maintain a good flow-rate.

This conventional boiler set-up does require that there be additional pipework to carry the primary and secondary heated water to and from the boiler, and obviously requires the extra tanks to hold the stored hot water and cold water feed. But the advantages of such a system are that numerous hot water demands can be met simultaneously. For example, more than one bath or sink or even a combination of both can be filled at the same time, as the water doesn't require heating 'on-the-fly' and therefore not reliant on the physical size and power output of the boiler. Also, the regular boiler set-up doesn't require the mains water pressure to be as high as a combi boiler and therefore can be installed more widely across the UK if it is the desired system.

Condensing Boilers (Hi efficiency)

A condensing boiler or 'energy-saving' boiler is a high efficiency boiler. In the UK from April 2005 all new gas central heating systems fitted must be high-efficiency condensing boilers unless there are exceptionally circumstances (and proven) where it is not possible to install such a condensing boiler system.

A condensing boiler system, is on average, approx 10-12% more efficient in it's operation. Additional heat is extracted from the waste gases where the water vapour is condensed into liquid water and it's latent heat recovered. Because of this process, condensing boilers do additional require an condensate drainage system (usually a small uPVC pipe) which exits the building or is fed into the sink drain or trap.

Nearly all new boilers are of the condensing type whether they are combi boilers or conventional boilers (regular boilers).

Other Boiler Types

There are additional boiler types used but these are much less frequent or usually replaced by the systems mentioned above. One such type is a 'back boiler'. These are usually situated behind gas fires or stoves and free-up a little extra space in the property.

Back Boilers can be connected to the hot water system or central heating system via an electrical pump and can recover heat from the gas stove or gas fire via the flue system. This recovered heat but must be effectively dispersed by the water or heating systems or overheating and boiling of the water can occur.
The 'back boiler' is strictly regulated in the UK following explosions resulting from incorrectly installed and poorly maintained units.

Boiler and Heating Systems Illustrated

Illustration kindly supplied by Worcester-Bosch. Copyright applies.

Fig.1 - A regular vented system


Regular vented gas boiler heating system layout

Fig.2 - An unvented system

An unvented gas boiler heating system layout


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