HERTFORDSHIRE, BEDFORDSHIRE & CAMBRIDGESHIRE
Boiler Servicing in Harlow
Annual boiler servicing across Harlow for £99 + VAT (£118.80 including VAT). The casing comes off, the flue gases are analysed and you keep a written record.
Inside the service
Asks how it has been running and checks the controls and pressure
Takes the casing off and inspects the internals for leaks and corrosion
Checks and cleans the burner, with the electrodes set correctly
Examines the heat exchanger for scale and sludge
Removes, flushes and refills the condensate trap
Checks the case seals and the flue, inside and out
Analyses the flue gases to confirm safe combustion
That is the routine for every boiler we service, a service being more than a glance at the display. We look after combi, system and regular boilers of all the common makes, whether or not we fitted them.
Get a fixed price before we start
Call and talk to an engineer, or send us the details and we will come back to you with a price.
The paperwork you should get
Every service ends with a written record showing the checks made, the combustion readings and anything that needs attention. If a reading is outside what the manufacturer allows, it says so.
Keep each year’s record. It is the proof a manufacturer asks for before honouring a warranty claim, and a buyer may want to see it if you sell.
If the engineer recommends something, it is written down with the reason, so you can decide later without having to remember the conversation.
Landlords get the gas safety record as a separate document when a CP12 check is carried out on the same visit, so the tenant can be given their copy.
Why it matters
Carbon monoxide cannot be seen or smelled. The flue gas analysis is the check that shows whether the boiler is burning safely, which makes it the most important part of the visit.
A clean burner and a clear heat exchanger also give more heat for the gas used. Over a winter, a boiler running badly out of adjustment costs more than the service does.
And most manufacturers require a yearly Gas Safe service to keep their guarantee valid. On the newer homes at Newhall, Church Langley and Gilden Park, that record may be what keeps a claim valid.
Finally, a service catches wear while it is still cheap to fix. Seals harden, electrodes wear and condensate traps silt up slowly, and each of those is easier to deal with on a planned visit than on a cold evening.
Harlow water in numbers
Affinity Water supplies Harlow and publishes two zone reports for it. For 2025, Harlow North (AF024) averaged 330 mg/l as calcium carbonate, with samples from 265 to 438 mg/l. Harlow South (AF094) averaged 310 mg/l, ranging from 265 to 350.
Affinity classes anything above 300 as very hard, so both zones qualify. The wide spread in the North zone also means two homes in Harlow can have noticeably different water. The reports do not say which streets are in which zone.
For a boiler, very hard water means scale on the hottest surfaces: the main heat exchanger, and in a combi the plate heat exchanger on the hot water side. We look for it on every Harlow service.
In an older boiler, a rumble or bang as the burner fires is often the first sign that scale or sludge is restricting flow. Mention it when you book so the engineer can pay particular attention.
Keeping scale in check
Harlow’s averages sit well beyond the 200 mg/l level at which Building Regulations guidance says a combi’s feed should be treated, so a scale reducer on the incoming main is often worth having.
If you have one, we check it is still working; some types need a new cartridge after a period. If you do not, we tell you whether it would help your boiler, and leave it off where it would not.
The water inside the heating circuit matters too. We check whether it is clean and whether inhibitor is still present, because older steel radiators corrode and the sludge ends up in the boiler.
If a cylinder heats your hot water, the same hardness furs its coil and immersion element. If the cylinder takes an age to reheat after a bath, say so when you book.
Cost
An annual service on a Harlow boiler costs £99 + VAT (£118.80 including VAT). Weekday appointments between 8am and 5pm have no call-out fee.
Tagging a service onto a repair visit costs £50 + VAT (£60 including VAT) and adds about thirty minutes, saving a second trip later.
If the service shows a part needs replacing, you are told what it is and what it will cost before anything is fitted. The full list of rates is on our pricing page.
Checked properly, recorded properly
Casing off, burner and heat exchanger inspected, flue gas readings taken, and a written record of what we found.
How long, and when
Time on site
Most services take around an hour. A boiler that has gone a few years without one, or has a badly blocked condensate trap, can take longer.
The best months
September or October. The engineer sees the boiler before it runs every day, and there is time to fix anything before the first frost.
On the day
Clear the cupboard around the boiler and make sure the flue outside can be reached by eye. If you have a back boiler or gravity hot water, mention it when you book.
Older systems
Where a regular boiler is fed from a tank in the loft, we look at the feed and expansion arrangement as part of the visit and mention anything that needs attention, such as a tank without a lid.
Landlords, flats and maisonettes
If you let a house, flat or maisonette in Harlow, the annual gas safety check and record (CP12) can be done on the same visit as the service, so the tenant only needs to be in once.
Tell us if the property shares any supply or access arrangement with a neighbour, and in a block give the flat number and where the boiler sits. It keeps the visit short for everyone.
Council and housing association tenants should leave servicing to their landlord, who is normally responsible for it. Our landlord gas safety certificate page covers the check in more detail.
Signs a service is overdue
Boilers often give warning before they fail. Any of these is worth mentioning:
No written service record in the last year
A yellow or lazy flame where you can see it
Sooty marks on the casing or near the flue
Pressure that creeps down between top ups
Hot water that surges or fades
New noises such as kettling
A sooty mark or a yellow flame is a reason to switch the boiler off and call, not to wait for a routine date.
When the service finds a problem
Sometimes a service turns up a worn seal, a failing sensor or scale that is already affecting hot water. The engineer explains it, notes it on the record and gives you a price before doing anything else.
Anything that makes the boiler unsafe is dealt with on the spot and explained plainly. Otherwise the timing is your choice, and any repair carries our 12 month labour guarantee.
Where the heating water is heavy with sludge, a power flush from £595 + VAT for up to five radiators, inhibitor included, may help. We check the water first and say plainly when a flush is not what is needed. See power flushing in Harlow.
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Why choose Vantage
Rated 4.9 on Google from more than 700 reviews across Google, Checkatrade and Trustatrader. Qualified, accredited engineers, a fixed price before any work begins and a labour guarantee on every job, from an established local company with an office team you can actually reach. No job too small.
Gas Safe registered
Company registration 956889. Every gas engineer carries their own Gas Safe ID card, and you can ask to see it.
Refcom F-Gas certified
REF1024550. Legally required for air conditioning installation and servicing, and we hold it.
CHAS Elite accredited
Veriforce CHAS assessed for health and safety, which is why commercial clients and landlords use us.
City & Guilds and BPEC qualified
Qualified, insured engineers on every job. No subcontracted strangers.
700+ reviews, 4.9 on Google
Across Google, Checkatrade and Trustatrader. Read them before you book.
Labour guarantee on every job
12 months on repairs, installations and everything else. Two years on a full bathroom refit. If anything we did develops a fault, we come back and put it right.
Fixed price before we start
The price is agreed with you before any work begins. No hidden extras on the invoice.
24/7, answered by a person
The emergency line is answered every day of the year by someone who can send an engineer, not a call centre.
Fully stocked vans
Five vans carrying the parts that fail most often, so most jobs are fixed on the first visit.
An office team behind every job
An established local business with multiple engineers and a dedicated office team to keep you informed.
Vaillant myREWARDS and Ideal Max accredited
Accredited installer status means extended manufacturer warranties on the boilers we fit.
Emergency response within the hour
Our average response to an emergency call is under an hour across Hertfordshire, Bedfordshire and Cambridgeshire.
Trusted & Accredited Professionals
Frequently asked questions
How much is a boiler service in Harlow?
£99 + VAT (£118.80 including VAT), or £50 + VAT (£60 including VAT) if added while we are with you for a repair.
Is Harlow water bad for boilers?
It is very hard in both supply zones, so scale is a real risk for combis. Every service includes a check for it.
Can landlords get a CP12 on the same visit?
Yes. The gas safety check and record can be done alongside the service.
Do you check the flue?
Yes. The flue is inspected on every service where it can be seen, inside and out, and flue gas analysis confirms the boiler is burning safely.
When should I book?
September or October, before the heating season starts in earnest and while there is time to sort any fault.
How long does a service take?
Around an hour for most boilers, longer if it has missed a few years.
Do you service back boilers?
Tell us when you book. We will check it and give you an honest view of its condition, including whether it is worth keeping.
Is scale protection worth fitting in Harlow?
Usually. Guidance says water above 200 mg/l should be treated before it feeds a combi, and Harlow’s averages are above 300.
What paperwork do I get?
A written record of the checks, the flue gas readings and anything that needs attention. Keep it with the boiler manual for warranty claims.
I rent from the council. Should I book a service?
Normally your landlord arranges it. Ask them before booking one yourself.
Will the engineer tell me if my heating water is dirty?
Yes. We check the water and the inhibitor on every service, and if sludge is building we explain whether cleaning it is worth the cost.
Areas we cover around Harlow
We service boilers across CM17, CM18, CM19 and CM20, in Old Harlow, Mark Hall, Netteswell, Latton, Tye Green, Potter Street, Great Parndon and Little Parndon.
Church Langley, Newhall, Gilden Park, Sumners and Katherines are covered too, by our own engineers under Gas Safe registration 956889.
Our engineers work from our base in Stevenage, and every service comes with our 12 month labour guarantee on any work we carry out.
Book a Harlow boiler service
Phone 01462 506 374 and ask for an autumn appointment in CM17 to CM20. Say which boiler you have and whether you need a CP12 as well.
Related services
All makes, Gas Safe engineers
CP12 checks and records
Fixed price swaps from £2,375 + VAT
Sludge out, heat back, from £595 + VAT
Compliance on one account
Every rate, published