spanner icon

Servicing Your Boiler

We take great pride in our work and performing each service to the highest industry standards attainable. We will always give you a summary of work, answer any questions and give you advice to make your heating system more efficient.

Not only will the boiler maintain it’s efficiency from the service, but it will also give you added peace of mind knowing it is safe.

If your boiler is not serviced annually, it is at higher risk of breaking down and costing you more money in the long run. Cleaning the boiler internally provides a chance to look for tell-tale signs that parts of the boiler may need replacing.

Old steel heat exchangers will often leave rust marks, which can give a warning that the boiler will soon need to be replaced. This approach can limit the possibility of water damage occurring and enables replacement work to be planned rather than having the inconvenience of trying to arrange a boiler replacement at short notice when a heat exchanger unexpectedly fails.

Long term damage can also occur if the boiler is not serviced regularly. During the combustion process, deposits will build up on the internal surfaces of the heat exchanger and the baffles which can decrease
boiler efficiency, and therefore become more costly to run, and worse
for the environment.

If left for too long, these deposits harden and with some designs of heat exchanger render it impossible to remove the baffles without destroying them. A replacement baffle will come at a significant cost on top of the routine service charge.

Book Now

Oil Boiler Servicing

Having an oil fired boiler serviced regularly can keep your boiler operating at its most efficient. It is recommended that oil fired appliances and equipment are serviced at least once a year or as recommended by the manufacturer. This keeps fuel costs down and reduces the risk and inconvenience of having costly breakdowns and repairs.

There are many reasons why the efficiency of an oil fired boiler could be reduced if not serviced regularly.


Here are a few:
red exclamation point
Excessive smoke and partially burnt fuel deposits can cause soot to collect within the boiler heat exchanger, restricting the amount of heat that can be transferred into the heating system water. The cleaner the heat exchanger is, the more efficient the boiler will be.
red exclamation point
Oil nozzles regulate how much oil passes through the burner. The nozzles are consumable items that wear over time affecting combustion and lowering boiler efficiency. If they are not replaced regularly, it can cause inefficiency due to poor combustion.
red exclamation point
Photocells can become coated with fuel deposits. Photocells are an important safety feature which detect whether the boiler is lit. If a photocell is dirty, it may not be able to detect the burner flame correctly and could cause the boiler to shut down erratically. Boilers frequently switching on and off at random will be less efficient than those running for longer periods due to the stress put on the unit starting up and turning off unexpectedly.
red exclamation point
Electrodes can wear and attract soot and deposits. Electrodes produce a spark to light the fuel, if they are in poor condition the boiler may not light.
Book Now

System Servicing

Did you know that your heating system collects debris and sludge over time which if left, clogs up radiators and valves making them much less efficient? This can also damage pumps, ultimately reducing the life of the heating system and significantly increasing the cost of running the system as more energy is required to achieve the same amount of heat. Merretts Heating Services provide several increasingly popular services to resolve this problem.

We offer the following services:

  • Chemical Flush
  • Powerflush
  • MagnaClean
Find Out More


Merretts Heating Services install modern boilers that can be very energy-efficient and manufacturers claim net seasonal operating efficiencies of up to 97%. As with gas boilers, the highest rated boilers will offer the greatest efficiency, and there are many ‘A’ rated models on the market. We are a diamond accredited installer with Worcester Bosch and can offer up to a 10 year guarantee.

Merretts Heating Services will visit you, have a free of charge consultation about your needs and tailor your quote to you. Whether it’s an emergency installation, pre-planned building works or just to update your current system, we endeavour to give you the right system for your requirements.

Our friendly office staff will liaise with you directly and will guide you through the whole process from start to finish.

Once the install has finished we will then commission the boiler and show you how your new heating system works and leave all paperwork with you on site. Before we leave the property we will always make sure that you are happy with the install and go through any questions you may have.

We understand that unforeseen emergencies or even planned boiler replacements can be difficult to afford, and we wouldn’t want you to cancel your well-deserved holiday or planned treat. In these instances, we can offer several finance packages to suit your budget.

Why choose us


We are Gas Safe and Oftec registered which means that we have been independently assessed to ensure you always receive a professional, safe and reliable service.

Request a quote

100% Safe

We are an independently verified provider and this means you can trust us to provide a professional, safe and reliable service.

What our customers Say

We have always used Merretts Heating for our boiler service and plumbing as we know they will turn up, do a good job so we don’t have to keep getting them back and they always leave things clean and tidy afterwards
No doubt you are aware what an ambassador John Green is for your company. John has been servicing our Rayburn for over 10 years and his fault finding which has recently been at the fore and his diligent approach to his work has not diminished, he continues to work to the highest standard. He is also willing to pass on any tips to help keep ones Rayburn running efficiently.
Thank you the response to me asking for help to restart the Aga. Very efficient and helpful. Helen was both (office staff).
Kyle is professional, capable and knows his stuff. I am therefore very happy with Kyle and his work ethic and am overall very satisfied. In fact, in future, I will actually ask for him by name as my preferred engineer to come out. He is a credit to Merretts Heating and did the tasks admirably well. Its always good to achieve a positive result and a satisfied customer. Kyle engendered a high level of trust with a final good, satisfaction rating.
Mr B has praised Callum for his visit to him to drain down and replace the zone valve on and Kyle for the service done.
I would like to formally record my thanks and congratulation to Merretts engineers on completion of their work at our house. The job was to remove the old heating system, based on the original installed when the house was built in 1950, and install a state of the art system. Their approach throughout was exemplary. They minimised the disturbance to us personally and to the structure of the house. This was no mean feat in itself considering the age of the old system . On the installation they showed great skill in running the new pipe work to minimise the exposure and affect on appearance It was a pleasure to have, often, four engineers around the property who were so accommodating and helpful They are a credit to Merretts in all senses Thank you for a job well done. I can thoroughly recommend your work.