Boiler Servicing in Milton Keynes
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An annual service is the least interesting thing you will buy for your house and one of the few that reliably pays for itself. It keeps the manufacturer’s warranty valid, it catches the components that are on their way out before they take the boiler down with them, and in a hard water area like this one it gives someone a reason to look at scale before it becomes a heat exchanger replacement.
It is also the service most commonly done badly. A genuine service takes time. A visual glance at the casing, a quick look at the flame and a sticker on the boiler takes ten minutes and is worth roughly what it costs.
This page sets out what a proper service actually includes, so you can judge whether the one you are being offered is real.
- Gas Safe registered 981362
- Fixed price agreed before we start
- Milton Keynes and 20 miles around
- 8am – 8pm, Mon to Sat
Last updated
What a real boiler service includes
The gas side
- Check the gas supply and working pressure at the appliance, and the standing pressure
- Check the gas rate, which is what the boiler is actually burning against what it should be
- Inspect the burner, injectors and heat exchanger for debris, corrosion and blockage
- Check the seals and the case seal, because a poor case seal on a room-sealed appliance is a safety issue not a cosmetic one
The flue and combustion
- Visual inspection of the full flue run, including the terminal outside and any concealed sections where inspection hatches allow
- Flue gas analysis with a calibrated analyser, checking the CO to CO2 ratio against the manufacturer’s stated figures
- Check for signs of spillage or recirculation
This is the part that separates a service from a look. A combustion analysis gives you a number you can compare year on year. A gradual drift in that number is an early warning long before anything visible happens.
The water and system side
- Pressure check, cold and hot, and expansion vessel charge
- Check the pressure relief valve and its discharge pipe
- Condensate trap clean and check, plus the external condensate run
- Check the magnetic filter and clean it if fitted, and comment on what has collected in it
- Check the system water condition, because sludge and inhibitor level tell you more about the next five years than almost anything else on the boiler
Safety and controls
- Check all safety devices operate
- Check controls and interlock function correctly
- Carbon monoxide alarm check if one is fitted, and a recommendation if one is not
You should receive a written record of what was checked and the readings taken, not just a date sticker.
Why your warranty depends on it
Manufacturer warranties on new boilers are conditional. Nearly all of them require an annual service by a Gas Safe registered engineer, recorded and dated, and they will ask for that record if you make a claim. A boiler that has not been serviced since installation is a boiler with a warranty that exists on paper only.
This is worth knowing in the first year, not the fifth. The most expensive version of this conversation is the one where a heat exchanger fails in year four and the claim is refused.
Servicing in a hard water area
Milton Keynes is supplied by Anglian Water and the water here is very hard. The average across the city sits around 300 mg/l of calcium carbonate, with MK8 measuring roughly 317 against a UK average of 207. Water above 200 is hard. Above 300 is where scale becomes visible on a kettle element within weeks.
For a service, that means a few things are worth more attention here than they would be in a soft water area:
The plate heat exchanger on a combi.
Scale here is progressive and it shows up first as hot water that fluctuates while the heating stays fine. Catching it at service stage is far cheaper than replacing the exchanger.
Domestic hot water temperature setting.
Running the hot water at maximum accelerates scale formation for no practical benefit, since you mix it with cold at the tap anyway. We will set it sensibly and explain why.
The scale reducer, if one is fitted.
Some types have a cartridge that needs periodic replacement. If yours has one and it has never been changed, it has stopped doing anything.
Cylinder coils and immersion elements
on stored hot water systems, which scale for exactly the same reason.
If nobody has mentioned water hardness to you at a previous service in Milton Keynes, that is a fair indication of how thorough the service was.
Landlords: a service and a gas safety certificate are not the same thing
This trips people up regularly, so worth being clear.
- A Landlord Gas Safety Record, commonly called a CP12, is a legal requirement. It is an annual safety check of the gas appliances, pipework and flues in a rented property. It confirms that the appliances are safe. It does not clean or maintain them.
- A boiler service is maintenance. It cleans, checks and adjusts the appliance so it keeps working and stays within warranty.
You can have one without the other. A property can pass a gas safety check while running a boiler that has never been serviced and is quietly heading for a failure. Most landlords are best served booking both together on the same visit, which is what we normally do.
How often, and when to book
Once a year
is the standard, and it is what warranties require.
Book it in late summer or early autumn.
Two reasons. First, if the service finds something, you have time to sort it before you actually need the heating. Second, every heating engineer in the country is busy from the first cold week in October, so a September appointment is easier to get and easier to schedule around your day.
If you have just moved in,
book one regardless of what the previous owner said. You have no record of what the boiler has had done, and a first service gives you a baseline reading to compare against next year.
What to expect from any engineer
- They should be Gas Safe registered, and you can ask to see the card. Ours is registration number 981362, and you can check any engineer at gassaferegister.co.uk.
- They should be there for a meaningful length of time. A proper service on a combi is not a ten minute job.
- They should use a flue gas analyser and give you the readings.
- They should remove the case and actually look inside, not just check the display.
- They should leave you a written record with readings, not only a sticker.
- They should tell you what they found, including the things that are fine, and flag anything that is trending in the wrong direction rather than waiting until it fails.
Frequently asked questions
How long does a boiler service take?
Allow around an hour for a standard combi in normal condition. Longer if the boiler has not been serviced for some time, or if the system water condition needs looking at properly.
Do I really need one every year?
If the boiler is under manufacturer warranty, yes, because the warranty depends on it. If it is out of warranty, an annual service is still the cheapest way to avoid the failures that happen in January. An older boiler benefits more from servicing, not less.
My boiler is working fine. Is a service a waste of money?
A service is not there to fix a boiler that is broken. It is there to find the things that are drifting before they stop. Combustion readings, expansion vessel charge and system water condition all deteriorate gradually and silently.
Will you tell me if my boiler needs replacing?
Yes, and we will tell you if it does not. We would rather service the same boiler for another eight years than sell you something you do not need.
Can you service a boiler you did not install?
Yes. Most of the boilers we service were fitted by someone else.
Do you service boilers in rental properties?
Yes, and we can carry out the gas safety certificate at the same visit. We can arrange access directly with tenants if that is easier for you.
What if you find something wrong?
We tell you what it is, what it means, and what it would cost to put right, before doing anything. Nothing gets carried out on the day without you agreeing to it first.
Do you service commercial appliances?
Yes, for offices, shops and small commercial units. Let us know the property type and appliance when booking.
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Areas we cover
Based in Two Mile Ash, working across Milton Keynes and a 20 mile radius including Bletchley, Wolverton, Stony Stratford, Newport Pagnell, Woburn Sands, Olney, Buckingham, Leighton Buzzard and Bedford. We service boilers in owner-occupied homes, rental properties and commercial premises.
- Milton Keynes
- Bletchley
- Newport Pagnell
- Wolverton
- Stony Stratford
- Woburn Sands
- Olney
- Buckingham
- Leighton Buzzard
- Bedford
- Towcester
- Winslow
- Cranfield
- Ampthill
Book a service
Call 07514 312117 or send a WhatsApp. Gas Safe registered 981362, CIPHE member, fully insured. Booked work Monday to Saturday, 8am to 8pm.