Oil boiler installation in Sittingbourne, Swale & Canterbury
Oil-fired boiler installation, replacement, repair and servicing for homes off the gas grid. OFTEC registered, so the installation is self-certified and your manufacturer warranty is valid.

Oil-fired boiler installation, replacement, repair and servicing
Oil boilers are less common than gas, found mainly in rural areas and larger properties with no mains gas supply: the farmhouses, cottages and village homes around Swale and Canterbury. Modern oil boilers are efficient and cost-effective to run, and a good one, properly installed and serviced, will give you many years of reliable heating.
We design, supply, install, service and repair oil-fired heating systems in residential properties, from country houses to standard homes. That includes the boiler, the oil tank and supply line, the hot-water cylinder, radiators and controls.
Your options
Oil boilers come as combi condensing and regular condensing models, and can be installed indoors or outdoors. The right choice depends on the type of property, your hot-water needs and your budget, so we advise after a look at the house rather than over the phone.
Every oil boiler needs a storage tank. Before deciding on a boiler it is worth getting expert advice on the tank too: its position, whether it is bunded, the condition of the supply pipe and the fire-separation distances all affect what can be installed and how safely it runs.
Why the registration matters
Oil boiler work should be carried out by an OFTEC registered engineer. It is usually a condition of the manufacturer warranty, and it means we can certify the installation ourselves under Building Regulations. We register the installation with the manufacturer for you, so warranty claims are straightforward if you ever need one.
If you are thinking about a new oil boiler, we will give you a fantastic price and a free site survey. Just call.
- Oil boiler replacementLike-for-like swaps of older boilers for modern condensing models, internal or external.
- New oil heating systemsBoiler, tank, cylinder, radiators and controls designed for the house.
- Oil tanks and linesBunded tanks, bases, fire valves and new supply lines fitted to current regulations.
- External boilersFree up the kitchen and keep the noise outside, on a proper plinth with a protected oil line.
- Hot-water cylindersUnvented cylinders for mains-pressure showers in bigger houses.
- OFTEC certificationInstallation self-certified under Building Regulations and registered for the warranty.
- Oil boiler servicingAnnual service with the OFTEC CD/11 report. See the oil boiler service page.
- Oil boiler repairsLockouts, burner faults, pump and nozzle problems, same or next day where we can.
What size boiler does your house need?
Tell us the rooms and watch the house build itself. We count the radiators the way an engineer would, then size the combi from the standard industry bands, and you get a quote request with the details already filled in.
Lounge, dining room, study and conservatory all count as living rooms. We add a radiator for the kitchen, hall and landing.
RadiatorsKnow your real count? Adjust it.
What is the old boiler costing you?
Slide to your yearly heating oil bill and pick the age of the boiler. The maths is simple: an old boiler wastes a share of every pound you spend.

Built for the Kent countryside
From the orchards around Faversham to the villages below the Downs, a lot of our oil work is in houses that have never had mains gas and never will. We have replaced boilers that were older than the engineers fitting them, and we know what a cold farmhouse needs from its heating.
Oil, gas and LPG on the same books also means we can give you an honest comparison if you are weighing up a switch.
Book a free surveyWhat customers say
Rated 4.9 out of 5 on Google reviews. The quotes below are copied word for word from the public listing.
I have used Sterling Heat on few occasions: removing old system and installing new combi boiler, connecting radiators, pipework adjustments, gas hob installation. Always professional and very helpful! Very knowledgeable! Best in the area!
We’ve used Gary several times since buying our house 7yrs ago for small jobs. Now we need a new boiler we feel lucky to have someone we know and trust to do a good job at a fair price.
Gary is great at his job and takes time to make sure it is done to the highest standard. I completely renovated my house so needed heating and wet plumbing.
Questions people ask us
Do I need an OFTEC registered engineer for an oil boiler?
In practice, yes. OFTEC registration lets us self-certify the installation under Building Regulations, and manufacturers normally require it for the warranty to be valid. An installation by an unregistered engineer can leave you with no warranty and a Building Control bill.
Internal or external oil boiler?
An external boiler sits outside on a plinth, frees up space in the kitchen or utility room, and keeps the noise outside. An internal boiler is usually a little more efficient and easier to protect from frost. We look at the site, the flue options and the oil line and recommend one.
Combi or regular oil boiler?
Oil combis exist and work well in smaller homes, but most oil-heated houses are larger and have more than one bathroom, where a regular or system boiler with a hot-water cylinder gives better flow. We size it to how the house uses hot water.
Can you replace or move my oil tank?
Yes. We supply and fit bunded tanks, bases and new oil lines, and we check the existing tank against the current regulations as part of every survey and service.
Is oil still a sensible choice?
For a house with no mains gas, a modern condensing oil boiler is one of the cheapest ways to heat it, and it is far more efficient than the boiler it replaces. We give you a straight view at the survey, including whether an upgrade of the existing system is worth it.
Need an oil boiler fitted or replaced?
OFTEC registered engineers, free survey, written quote.
Get a free oil boiler quote
Tell us what you need and we will call you back, usually the same working day. No obligation, and we never pass your details on.
- info@sterling-heat.co.uk
- Hours
- Mon to Fri, 8am to 6pm
- Based in
- 40 Homewood Avenue, Sittingbourne, Kent ME10 1XW
- Covering
- Sittingbourne, Sheerness, Isle of Sheppey, Faversham, Canterbury and across Kent
Free quotes and site surveys for new boilers and full systems. For a breakdown, call: most problems are dealt with the same or next day.