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A Viessmann boiler replacing an older one in a tiled kitchen, with new gas and water connections below

Boiler and Heating Engineer in Chalfont St Giles

Heating Engineers in Chalfont St Giles

Local, Gas Safe registered boiler and heating engineer covering Chalfont St Giles and the surrounding area. Fixed prices, no call-out fee and a one year guarantee.

Gas Safe Registered Registration 586325
Viessmann Accredited Approved installers
Heat Geek Andrew, Heat Geek Elitist
One Year Guarantee On our work and parts

Information on this page last reviewed September 2026.

Gas Safe boiler and heating engineers in Chalfont St Giles

In February 2014 the ground under Chalfont St Giles was so wet that it flooded a water pumping station. The council's own investigation records that groundwater in the chalk rose high enough to flood the Affinity Water pumping station serving the village, which ceased pumping on 11 February and resumed on 20 February. It says something about the ground every boiler here sits on. Home Comfort Assured is a Gas Safe registered heating firm based in Watford, number 586325, with no call-out fee. Boiler servicing, repairs and replacements are the core of what we do in the village. The number is 07970 632 064.

Wall mounted boiler on a plywood board with copper pipework, grey expansion vessel and filter in a bare room

Local knowledge

Why Chalfont St Giles customers call us

Pumping station flooded, 2014

The council's investigation found that exceptionally high groundwater in the chalk flooded the Affinity Water pumping station and the BT exchange in February and March 2014, and disrupted traffic on the main street into the shops. Four commercial premises were flooded inside.

288 mg/l on Affinity's lookup

Eight of nine village postcodes we sampled fell in Affinity's Beaconsfield and Chalfont St Giles zone, which reads 288 mg/l in its 2025 report. That is in Affinity's hard band, from one sample, with one postcode in the neighbouring zone.

61.5% detached

In the Census area covering the village and Seer Green, 61.5% of households live in detached houses and 44.8% own outright, while only 6.4% live in purpose-built flats. It is the largest-house, lowest-flat profile of the five towns we work in.

Three Grade I buildings

Milton's Cottage, the church of St Giles and Jordans Meeting House are all Grade I. Milton's Cottage is an early seventeenth century timber-framed house with red brick infill, and the parish has many more listed buildings behind them.

A conservation area since 1969

The village centre was designated in 1969 and extended in 2001 to take in a garden and field beside Milton's Cottage. The appraisal is a scanned Chiltern District document, and the council publishes no flue wording of its own.

Gas for about 83%

In the ward covering the village 83.0% of households heat with mains gas alone, and about one in fifty with oil. We work on gas only, which covers most homes here.

On the ground

Areas we cover in Chalfont St Giles

We cover HP8.

The village centre

HP8

The High Street and Pheasant Hill, where the council's 2014 report found the surface water and river flood extents very similar and several commercial and residential properties at risk.

Jordans

HP9

A separate village inside the parish, with its own conservation area, Jordans Meeting House of 1688 and Old Jordans Hostel. Its postcodes are HP9, not HP8.

Seer Green

HP9

Its own parish with an HP9 postcode, sharing the Census ward with Chalfont St Giles. Figures for the ward include it.

Nightingales Lane and the surrounding lanes

HP8

Named in the council's earlier flood records for surface water, along with Bottrells Lane, Townfield Lane and Narcot Lane, in 2006 and 2007.

Little Chalfont, and what it is not

HP8

A separate parish that shares HP8 and the local ward name. The council's records and our figures for Chalfont St Giles do not cover it.

When the chalk fills up

The Misbourne runs north to south through the village. The council's investigation puts it plainly: as a chalk stream it gets most of its flow from the chalk aquifer, so when groundwater is high, so is the river. The village sits on Beaconsfield gravel along the line of the river, over Seaford and Newhaven chalk. In the spring of 2014 the flooding was caused, the report says, by exceptionally high groundwater in that chalk. It reached the pumping station and the telephone exchange, and pumping the exchange out then flooded the High Street and closed the council car park. Four commercial premises flooded inside. The council's older flood assessment adds that several properties and farm buildings in the village are in Flood Zone 3a.

No council document we read records sewer flooding in the village, and the record names the High Street and Pheasant Hill, not the whole parish. Most boilers here are nowhere near it. The practical consequence is narrow: a cellar that is damp in a wet winter may be groundwater and not a pipe, and a boiler, cylinder or pump at or below ground level is worth a conversation about where else it could go.

Big houses, old cottages and very few flats

The Census data for the area covering the village and neighbouring Seer Green describes a particular kind of place. 61.5% of households live in detached houses, against 23.2% across England and Wales, and only 6.4% in purpose-built flats. 81.5% own their home and 44.8% own it outright. The largest build period is 1955 to 1964, 720 of 3,360 properties, and 64% of homes are in council tax bands F to H, derived from rounded figures. Around 200, about one in seventeen, were standing before 1900.

That split matters for boilers. A large detached house often has more than one bathroom and more hot water drawn at once, and the answer to combi or system boiler follows that, not the brand. An older cottage has different questions, starting with the chimney. Historic England's advice is that not all chimneys can accept a new flue liner, because flues in traditional buildings can be narrow, contorted or distorted by years of movement, and forcing a liner down one risks damage to historic fabric.

A village with three Grade I buildings

Milton's Cottage on Dean Way is Grade I, described on its list entry as an early seventeenth century house, timber framed with red brick infill. So are the parish church of St Giles and Jordans Meeting House, dated 1688. There are Grade II* and Grade II entries besides: The Old Rectory, The Vache, several pubs, and Roughwood Farmhouse, which the entry says was very probably extended by C.F.A. Voysey in 1902. The council's local heritage list adds a number of locally listed buildings in the village, at Jordans and at the Chiltern Open Air Museum, whose buildings were moved there from elsewhere and are not part of the village's own stock.

The village centre has been a conservation area since 1969, extended in 2001, and Jordans has its own. The appraisals are Chiltern District Council documents and scans, so the council's current pages carry no flue wording of their own. For a house the national rule applies: in a conservation area, a flue on a wall or roof slope that fronts a highway and forms the principal or side elevation needs planning permission. The council's current list of Article 4 directions has nothing covering the village. If your house is listed, the test is whether the work affects its special character, and there is no blanket rule either way, so ask before assuming.

On the edge of the Chilterns

The made neighbourhood plan says the parish sits on the edge of the Chilterns Area of Outstanding Natural Beauty, now called a National Landscape, and the parish council next door says much of it lies inside. The plan also records that much of the parish is in the Green Belt but that the village itself is a built-up area outside it. Which side of the National Landscape boundary a house is on has to be checked address by address. It matters to a flue, because on that land the same rule about highway-facing principal and side elevations applies whether or not the house is in a conservation area.

Jordans, Seer Green and the lanes

The parish is bigger than the village. Jordans, with Jordans Meeting House of 1688, Old Jordans Hostel and the Mayflower Barn, is a separate settlement inside it, and the council's Green Belt wording in the neighbourhood plan says most of the parish's housing is in the village and Jordans. Jordans postcodes are HP9, not HP8, and Seer Green next door is its own parish that shares the Census ward. Little Chalfont is a third place altogether, in its own parish. When the council writes about "the Chalfonts", it is often not saying which, and we have tried not to borrow a record that belongs to a neighbour. If you are in Jordans or Seer Green, tell us the address and we will say plainly whether it is on our patch.

Water at 288 mg/l

Affinity Water supplies the village. Its own postcode lookup put eight of the nine postcodes we sampled in the Beaconsfield and Chalfont St Giles zone, where the 2025 report gives total hardness of 288 mg/l from one sample. Affinity's own scale calls 151 to 300 hard. The ninth postcode, HP8 4QB, was in the Rickmansworth zone at 283. On a new installation scale protection is worth discussing, and on an existing system an annual service is how scale gets caught early.

Who does the work

Andrew Millward brings forty years in the trade, and he is a Heat Geek Elitist and Viessmann accredited. Elis Harizi does all our bathroom work. Any major make of boiler is fine by us. We are gas engineers only, so an oil-fired or bottled gas system is not something we can take on.

Around Chalfont St Giles

Chalfont St Peter is down the valley on the same river and has a longer flood record than this village. Amersham is up it, and Gerrards Cross is to the south. Our heating page lists the full range of heating work.

For a service, a repair or a new boiler in the village, call Andrew or Elis on 07970 632 064.

Need us in Chalfont St Giles?

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 Chalfont St Giles.

Step by step

Booking a heating engineer in Chalfont St Giles

A village of older cottages and large houses, so the first questions are about the building.

  1. Ring and say what the heating is doing

    Call 07970 632 064 and tell us what has stopped working or what you want to replace. You speak to Andrew or Elis.

  2. Give us the address and the fuel

    We need the road, because the village, Jordans and Seer Green are different places, and the fuel, because we work on gas only.

  3. We look at the chimney, flue and ground

    For an older cottage we check whether the chimney can take a liner, where a flue could come out, and whether the address is listed or in a conservation area. There is no call-out fee.

  4. The work

    Andrew or Elis does the job.

Common questions

What happened to the pumping station in Chalfont St Giles in 2014?

Groundwater in the chalk rose so high in February 2014 that the Affinity Water pumping station serving the village was flooded and stopped pumping on 11 February, resuming on 20 February, according to the council's investigation. The BT telephone exchange flooded too. It is the clearest local evidence that the ground here is wet in a wet winter, and worth knowing if your boiler, cylinder or a pump sits below ground level.

How hard is the water in Chalfont St Giles?

Affinity Water's own postcode lookup put eight of the nine village postcodes we sampled in its Beaconsfield and Chalfont St Giles zone, where the 2025 report gives 288 mg/l of total hardness, in the band Affinity calls hard. One postcode, HP8 4QB, came back in the neighbouring Rickmansworth zone at 283. Each figure is one sample in the year, so use Affinity's checker for your own address.

Can the chimney in my old cottage take a new boiler flue?

Not always. Historic England's advice is that not every chimney can accept a new liner, because flues in traditional buildings can be narrow, contorted or distorted by movement, and forcing a flexible liner down one risks damaging historic fabric. In a village with three Grade I buildings and a conservation area, that is worth a proper look before a boiler is chosen.

Is Chalfont St Giles in the Chilterns National Landscape?

The parish is on the edge of it, according to the made neighbourhood plan, and the parish council next door says much of the parish lies inside. Whether your own address does has to be checked for that address, and it matters: on National Landscape land a flue on a principal or side elevation facing a highway needs planning permission, in a conservation area or not. The council's current Article 4 list has nothing covering the village.

Do you work on oil boilers or LPG?

No. We are gas engineers. Around 83% of households in the Census ward that covers the village and its neighbours heat with mains gas alone, and about one in fifty with oil, so most homes are on the gas network. If you are on oil or bottled gas, we are not the right firm and would rather say so.

Are you Gas Safe registered?

We are, under number 586325. The Gas Safe Register will confirm it, and our engineers carry their card.

Recent work nearby

See more of our work
White system boiler in an airing cupboard above neatly clipped copper pipes, an inline filter and a pressure gauge
White system boiler in an airing cupboard above neatly clipped copper pipes, an inline filter and a pressure gauge. Photographed in Rickmansworth.
Worcester branded boiler in a narrow cupboard with a vertical flue, red expansion vessel and copper pipework
Worcester branded boiler in a narrow cupboard with a vertical flue, red expansion vessel and copper pipework. Photographed in Rickmansworth.
Wall mounted Viessmann boiler with two black pump stations, copper pipework, red expansion vessel and cylinder
Wall mounted Viessmann boiler with two black pump stations, copper pipework, red expansion vessel and cylinder. Photographed in Watford.

What our customers say

See more reviews on TrustATrader
Andrew clearly knows his stuff and was able to get a grip of our very old central heating system and refurbish it to modern standards. It was a complicated task that others had baulked at, and very few could have tackled. I cannot recommend him highly enough.
Richard · TrustATrader review
Really friendly, helpful and knowledgeable. Very happy with the work.
Rebecca · TrustATrader review
Quick, friendly, professional service, thank you Elis. Will use for all servicing from now on.
Jon · TrustATrader review

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 at Home Comfort Assured

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 at Home Comfort Assured

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.