Boiler and Heating Engineer in Croxley Green
Heating Engineers in Croxley Green
Local, Gas Safe registered boiler and heating engineer covering Croxley Green and the surrounding area. Fixed prices, no call-out fee and a one year guarantee.
Information on this page last reviewed September 2026.
Gas Safe heating engineers covering Croxley Green
Home Comfort Assured is a small Watford heating firm covering Croxley Green and WD3. Andrew and Elis do the work themselves. We are Gas Safe registered under number 586325, there is no call-out fee and no charge for quoting, and the person who prices your job is the person who does it.
Boiler repairs, servicing and replacements are most of what we do here, in a town where most of the houses were built within a few years of each other. Ring 07970 632 064 and tell us what the system is doing.
What we do here
- Boiler repairs and fault finding
- Annual servicing, with a written report
- Rebalancing systems that have been extended rather than designed
- Radiators, valves and thermostats that have stopped doing their job
- Power flushing, system cleaning and magnetic filters
- Weather compensation and modern controls on an existing boiler
- New boilers and replacements
- Hot water cylinders
- General plumbing, from a dripping tap upwards
What we do
Our services in Croxley Green
Boiler repairs and servicing
Breakdowns, fault finding, annual servicing and replacement, on every major brand.
Read moreCentral heating
Radiators, valves, controls, power flushing and full system installation.
Read morePlumbing
Leaks and burst pipes, taps, cylinders, bathrooms and appliance installation.
Read moreUnderfloor heating
Design, installation and repair, wet systems in new builds and retrofits.
Read moreViessmann boilers
Why we are accredited, what the range does well, and how it compares.
Read moreLocal knowledge
Why Croxley Green customers call us
71.7% semi-detached in Durrants ward
Nearly three in four homes in Durrants ward are semis, against 31.5% across England and Wales. It is the highest share of one house type in any ward we cover, so the layouts in this half of town repeat street after street.
1,570 homes from 1930 to 1939
The VOA's 2025 count for the area covering both Croxley Green wards puts 1,570 of 3,860 properties in that single decade, roughly two in five. Houses approaching a century old have usually had their heating replaced more than once, so the job is often deciding what to keep.
A station opened on 2 November 1925
Croxley station arrived on the Metropolitan Railway's Watford branch thirty-six years after Chorleywood's, and most of the housing followed it. That later, tighter building burst is why this town reads so differently from its neighbour up the line.
85.4% owner-occupied, 43.6% outright
Durrants has the highest ownership in the patch and private renting of only 8.8%, less than half the national rate. The person deciding about the boiler is almost always the person who lives with it, and there is rarely a landlord in the chain.
Dickinson Square: windows and doors only
The square was designated on 15 June 1995 and its 1996 Article 4 direction covers windows and doors on front elevations. It does not reach chimneys, flues or soil and vent pipes, which is a real difference from the Chorleywood Common rule a few miles away.
Groundwater risk in eastern Croxley Green
Three Rivers' 2026 flood assessment names eastern Croxley Green among the settlements at highest risk of groundwater flooding, and lists the town for historic sewer flooding risk. It is a risk classification, not a record of incidents here, but it is worth knowing before damp low down is blamed on a pipe.
On the ground
Areas we cover in Croxley Green
We cover WD3.
Croxley Green village
WD3The old village core in Dickinsons ward, where the paper mill employed the place from 1830 until it closed in 1980.
The Green
WD3Four WD3 3 postcodes sit here, all in Dickinsons ward and Croxley Green parish.
New Road
WD3The road created when the Hollow Tree land was sold for housing in 1864, well before the 1925 station and the interwar building that followed it.
Croxley station area
WD3The streets around the 1925 station, in Dickinsons ward and Croxley Green parish. The ONS labels the wider built-up area Rickmansworth, which is wrong for this patch.
Croxley Business Park
WD18A WD18 postcode that is administratively Three Rivers and Croxley Green parish, while its built-up area is recorded as Watford. If you have a WD18 address here, tell us the road and we will work out which page fits.
A town of one house, built in one decade
Croxley Green is the most uniform town we work in, and that is genuinely useful to a customer rather than just an observation.
Roughly two in five properties here date from the single decade 1930 to 1939. In the Durrants half of the town, 71.7% of homes are semi-detached, against 31.5% across England and Wales. That is the highest concentration of one house type anywhere on our patch.
The reason is the railway. Croxley station opened on 2 November 1925 on the Metropolitan Railway's Watford branch, and the builders followed within a few years. The town already existed before that, around The Green and the old village, and John Dickinson's paper mill had been running on the canal bank since 1830, employing the place. But the housing most people live in went up in that one burst.
For us that means the second visit to a Croxley Green semi is quicker than the first. The same bathroom sits over the same kitchen. The original supply runs took the same route. The boiler has usually been moved to the kitchen at some point in the last forty years, leaving a long cold run to the upstairs taps. And there is nearly always a chimney breast that somebody assumes will take a flue.
Systems that grew rather than got designed
These houses are approaching a century old and almost none has its original heating.
What we usually find is three eras of pipework in one house: whatever survived from the first system, whatever went in when the boiler moved, and whatever the last installer added. Radiator circuits get extended rather than rebalanced, so the far end of the house never quite keeps up. Controls get left on the settings that suited a boiler two replacements ago.
None of that is a disaster and none of it means you need a new boiler. Balancing a system properly, replacing the valves that have stopped closing, fitting a magnetic filter and setting the controls up for the appliance that is actually there will often do more for how the house feels than the appliance itself. On a condensing boiler, weather compensation is worth having and is still fitted far too rarely.
A related point about who lives here. Croxley Green has the highest owner-occupation on our patch: 85.4% owned in the Durrants ward, with 43.6% owning outright. People have generally been in these houses a long time. That usually means a heating system with a long history and no landlord in the chain, so decisions get made by the person who has to live with them. We would rather explain the options properly than sell the biggest thing on the list.
Hard water, and why we will not quote you a number
Affinity Water supplies Croxley Green. Their own description of their whole supply area is that it has hard water, and that is certainly true here.
We are not going to give you a figure, and it is worth saying why. Affinity does not publish which of its supply zones covers this town, and Croxley Green sits between three of them: the Rickmansworth zone reads 283 mg/l, Watford North 323 and Watford South 353. That is a wide gap and picking one would be a guess dressed up as a fact. Affinity's postcode lookup will give you the reading for your own address.
What is not in doubt is what hard water does. Scale settles wherever water is heated: on the hot side of a heat exchanger, inside a cylinder, around an immersion element. In a town where cylinders have often been in place for decades, it shows up as a cylinder that never quite gets hot rather than as anything dramatic. On a new installation we fit scale protection as standard, and on an existing system we will tell you honestly whether it is worth adding.
Damp that is not a leak
Three Rivers District Council's flood assessment names eastern Croxley Green among the areas at highest risk of groundwater flooding, alongside Rickmansworth and Loudwater. It also lists the town among those with the greatest historic risk of sewer flooding.
The ground explains it. The council's own conservation area appraisal describes the local geology as gravel and chalk bedrock, with alluvial deposits of sand, silt, clay and gravel along the adjacent river valleys. Water moves through that and the eastern side of the town sits closest to the valley.
Two practical consequences. Damp low down in a house here is not automatically a leak, and it is worth establishing which it is before anyone sells you a repair for a problem you do not have. And below ground is a poor place for anything you care about, so a cylinder, a pump or a manifold in a cellar is worth raising or protecting rather than discovering the hard way.
We are not flood specialists and this is not most jobs. It is simply worth knowing, and a firm from outside the district generally does not.
Flues and the conservation area
Croxley Green has a conservation area, and the appraisal for it dates from 1996. The Dickinson Square area within the town was designated separately on 15 June 1995.
There is no Article 4 direction here that restricts a flue. The Dickinson Square direction, made in 1996, covers windows and doors on front elevations only, in the council's own words "to retain the authenticity of windows and doors on front elevations". Nothing in Croxley Green touches chimneys, flues or soil and vent pipes.
So the position is the ordinary one: conservation area status still bears on where a flue can sensibly terminate on a visible elevation, Three Rivers publishes no wording of its own about flues, and the council asks residents to check specific cases with the planning department.
Worth knowing if you are comparing notes with a neighbour in Chorleywood: the rules there are stricter. The Chorleywood Common direction does cover chimneys. The district is not uniform and people assume it is.
Who turns up
Andrew Millward, founder. Forty years in the trade, Viessmann accredited and a Heat Geek Elite, and the one to send at a fault nobody else has pinned down. Elis Harizi, director, in the trade since 2007 and a Heat Geek member, who does most of our installation, cylinder and underfloor work. No subcontractors.
We are Viessmann accredited and it is the brand we recommend most often, but we service and install every major make and we are not paid to prefer one.
How we work
- No call-out fee, no charge for quoting
- A fixed price agreed before the work starts
- One year guarantee on our workmanship
- Monday to Friday 8am to 9pm, Saturday and Sunday 9am to 5pm
Around Croxley Green
We work across this corner of Hertfordshire, including Rickmansworth and Chorleywood next door, and Watford where we are based. The full range of heating work is on our heating page, and we take plumbing work here too, from leaks and taps to full bathrooms, on our plumbing page.
To book a service, get a fault looked at or get a price for a replacement, call Andrew or Elis on 07970 632 064.
Need us in Croxley Green?
Call and speak to the engineer who will do the work, or ask for a quote. No call-out fee, and a one year guarantee on what we do in Croxley Green.
Step by step
Booking a heating engineer in Croxley Green
Most of the houses here were built within a few years of each other, so we start by asking which one is yours.
Call and describe what the system does
Ring 07970 632 064 and tell us what the boiler or radiators are doing. You speak to Andrew or Elis, and the person who quotes is the person who does the work.
Give us the road and the postcode
WD3 covers several towns and Croxley Business Park is a WD18 address inside Croxley Green parish, so the road tells us where you are. If you are on Dickinson Square we check the conservation area position before we talk about flues.
We look at the system, not just the boiler
In a house this age the pipework often comes from more than one era, so we look at the circuits, valves and controls before recommending anything. There is no call-out fee and no charge for quoting.
The work
Andrew or Elis carries out the job themselves.
Common questions
Do you know the 1930s semis here?
Very well, because there are a lot of them. Roughly two in five properties in Croxley Green went up in the single decade between 1930 and 1939, and in the Durrants half of the town nearly three quarters of homes are semi-detached. That means we tend to know the layout before we lift a floorboard: where the original pipe runs went, where the boiler was moved to when the kitchen was done, and which chimney breast somebody is about to ask us to put a flue through.
Why does my heating feel like it was designed for a different house?
Because it probably was, several times over. These houses are approaching a hundred years old and most have been through three or four boilers, a kitchen extension and at least one rethink of where the hot water comes from. What you often end up with is a system that works but was never designed as a whole: pipework of three different eras, a radiator circuit that was extended rather than rebalanced, and controls fitted to suit a boiler that has since been replaced twice. Sorting that out is usually cheaper than people expect and makes more difference than a new appliance on its own.
I am in the conservation area. Do I need permission to move a flue?
The conservation area rules apply, so where a flue goes matters, but there is no Article 4 direction in Croxley Green that restricts flues. The one at Dickinson Square covers windows and doors on front elevations only. Three Rivers publishes no wording of its own about flues, so the national permitted development position governs and the council asks you to check specific cases with them. That is what we do rather than guess. Chorleywood next door is stricter, which surprises people who assume the rules are the same across the district.
How hard is the water in Croxley Green?
Hard, and we are not going to give you a number. Affinity Water supplies the town but does not publish which of its supply zones covers it, and Croxley Green sits between three of them whose readings run from 283 to 353 mg/l. That is too wide a gap to pick from honestly. Affinity's own description of its whole area is that the water is hard, which is certainly true here, and their postcode lookup will give you the figure for your own address. What matters practically is that scale builds in cylinders and heat exchangers and is worth designing around.
My cellar or downstairs gets damp. Could that be groundwater?
Possibly, particularly at the eastern end of the town. Three Rivers District Council's flood assessment names eastern Croxley Green among the areas at highest risk of groundwater flooding, alongside Rickmansworth and Loudwater, and it also lists the town among those with the greatest historic risk of sewer flooding. So before anyone starts chasing a pipe it is worth establishing whether the water is coming out of your plumbing or out of the ground. Those are different problems with different answers.
Are you Gas Safe registered?
Yes, registration number 586325. You can check it on the Gas Safe Register before we visit, and the engineer will carry their card.
Recent work nearby
See more of our work
What our customers say
See more reviews on TrustATraderElis is an outstanding plumber. We had several complicated heating issues that he resolved quickly and efficiently, and he took the time to explain the options clearly. He really cared about making sure we were happy. I have not come across anyone better in over 40 years.
Elis is highly professional and clearly takes pride in his work. He serviced and repaired our Viessmann boiler efficiently, explaining the process at every stage. I highly recommend Elis.
We have been recommending Andrew, and now Elis too, for over 20 years. That speaks for itself. Always the best job, thank you.
Meet your engineers
The engineers who turn up
Two engineers, both Gas Safe registered under registration 586325. When you book Home Comfort Assured, this is who does the work.
Andrew Millward
Founder and heating engineer
- 40+ years experience
- Heat Geek Elitist
- Viessmann accredited
Andrew has over 40 years in the trade and specialises in fault finding, boiler and heating repairs, and the design of energy efficient systems like heat pumps and underfloor heating.
Andrew on YouTube
Elis Harizi
Director and plumbing & heating engineer
- Plumbing since 2007
- Heat Geek member
- Gas qualified
Elis trained as a plumber in Greece in 2007, moved to England to gain his gas qualifications, and now designs and installs energy efficient heating as a Heat Geek member.
Got a job that needs sorting?
Call and speak to an engineer, or request a quote. No call-out fee, and we work across Hertfordshire and south Buckinghamshire.