Our fully qualified engineers are on hand to deal with all aspects of your central heating and hot water requirements. From annual servicing and certification through to fault finding, repairs, site surveying and installation of the latest condensing appliances, we’ve got it covered. Trained and experienced in all aspects of today’s heating industry, we routinely work on GAS, LPG and OIL. We hold the necessary GAS SAFE and OFGEM certification to keep you operating. Our senior gas engineer is also a registered member of IGEM and regularly attends seminars to keep abreast of changes in our industry.

With over 300 different boilers on the market, we have the broad knowledge and experience to work on all of them.

SERVICING: “prevention is better than cure”

Our thorough approach to your basic annual service is one of the founding principles of the company and should stand you in good stead through the cold winter months. In general you should expect a complete strip down and clean of your appliance, replacement of any consumable parts, followed by re-assembly and certification. We will also trace and inspect your gas pipework installation, providing a detailed diagram at your primary gas meter. We undertake a pressure test to the relevant IGEM standards to check for leaks to give you complete piece of mind. Once the paperwork is filled out we perform a check around the premises to confirm the correct operation of radiators, convectors, thermostatic radiator valves and controls.

FAULT FINDING: “we can fix it”

Our engineers are equipped with the tools and the knowledge, and are permitted the time, to trace and repair those faults which occur on a heating system from time to time. As a client you are covered by a 24 hour breakdown service with an engineer able to attend on the same day and often within an hour of your call should the situation require it. A member of our team is on hand to provide advice and a realistic solution to whatever we find on site.


In general our primary aim is to maintain any existing equipment and keep it working as efficiently as possible. Our view as a company is that this is still the most cost effective way of running a heating system. However, in some cases we find that replacement is the only viable way forward in order to ensure a satisfactory long term solution to an ageing or inefficient system. We have established good relationships with well known suppliers in order to bring you cost savings on the latest equipment. Our staff is also subject to ongoing training so that we can offer you the best possible service when it comes to specifying and installing new equipment.


...is an expression used (in the heating trade over many years) to denote the process by which heating systems are forcibly cleansed using water at high velocity, but low pressure, so that no physical damage is caused to the system.

The objective of power flushing is to restore systems with circulation and boiler noise problems (caused by sludge and corrosion deposits) to optimum operation. Power flushing removes these deposits and the problems that they cause. Power flushing, in conjunction with a system pre- clean, is also an excellent way to pre-commission clean new heating systems, to remove excess flux, swarf and other debris, and the grease and oil used to prevent rusting of components before use.

It is prudent to power flush a heating system immediately before fitting a new boiler to an existing system to prevent possible future problems. Many systems are found to contain corrosion and sludge, even if no flow problems have yet shown themselves.Existing debris are often mobilised by alterations to the system/piping and the increased efficiency of the new boiler, and may then accumulate in the boiler heat exchanger, causing noisy operation, reduced efficiency and, in extreme circumstances, failure of the boiler. The high efficiency and compactness of modern boilers, developed to minimise fuel costs and pollution, means that they are more susceptible to problems caused by debris in the system water.

How does it work?

We use the Clearflow power flushing pump which is simply connected into the heating system, either across standard circulator pump couplings, across the tails of one radiator, or wherever most practicable. The powerful flow, combined with instantaneous flow reverser device, will dislodge and mobilise deposits and corrosion which resist traditional system cleaning methods.

Once the corrosion and sludge deposits have been loosened and mobilised, fresh clean water is forced through the heating system, pushing the contaminated water out through a full bore dump valve to waste. During the Clearflow process, radiators are individually flushed, without removing or disconnecting them from the system, by directing the full output of the pump through each radiator separately.

At the end of the flushing process, the system contains fresh clean water and reinstatement of the system to normal operation takes only a few minutes.

System flushing will not remedy design or mechanical faults, which should be rectified, but in many cases it will cure the problems caused by these.


2011 DG Maintenance Services Ltd

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DG Maintenance Services Ltd
64 Wilbury Way | Hitchin | Hertfordshire | SG4 0TP

Heating and Air Conditioning Maintenance


Tel: 01438 840 534