No heat, no hot water, a boiler that’s locked out on a fault code or losing pressure? This page connects you with verified, Gas Safe registered engineers across Havering who repair boilers, from Romford and Hornchurch to Upminster and Rainham.

✅ Checked before listing — identity, insurance, trading presence, Gas Safe (where relevant).
How we verify →
✅ Workmanship guarantee badges on listings — 1, 3, 6 or 12 months

⚠️ Smell gas, or think the boiler’s producing fumes? Don’t touch electrics or switches, open a window, and from outside call the National Gas Emergency Service on 0800 111 999. Feel unwell with headaches or dizziness that ease when you leave the house? Treat it as possible carbon monoxide — full safety steps in Safety first ↓.

→ Find a verified Havering boiler engineer — see the verified list below.

Coverage: RM1, RM2, RM3, RM4, RM5, RM6, RM7, RM11, RM12, RM13, RM14 — Romford, Gidea Park, Collier Row, Harold Hill, Harold Wood, Hornchurch, Elm Park, Upminster, Cranham, Rainham, South Hornchurch and the rural-edge villages.
Boiler repairs covered: no heating or hot water, pressure loss, fault-code lockouts, ignition and pilot-light failure, kettling or banging, a leaking boiler, frozen condensate pipes, faulty diverter valves, pumps and PCBs, and repair-or-replace advice. Every listed engineer who works on your boiler is Gas Safe registered. For a boiler repair in Havering, use the verified list above.
Urgent, or can it wait? No heat or hot water with young children, elderly or unwell occupants in cold weather is worth treating as urgent — and if you smell gas or suspect carbon monoxide, follow Safety first ↓ before booking anyone. A fault code, intermittent fault or pressure niggle on a boiler that’s still running is usually a standard repair you can compare engineers for.
Not sure which page you need? If your radiators aren’t heating but the boiler’s running, that’s usually Central Heating Repair; if you want a new boiler, see Boiler Installation; for an annual service or gas safety check, Boiler Servicing; for an urgent no-heat situation with vulnerable occupants, Emergency Plumber.
Costs: see What it costs ↓ for an editorial estimate.

Jump to: What’s wrong with it? ↓ · Repair or replace ↓ · Hard water & Havering boilers ↓ · Safety first ↓ · By district ↓ · What it costs ↓ · FAQs ↓

What’s actually wrong with your boiler?

A boiler that’s stopped usually gives a clue, and a Gas Safe engineer reads it before opening anything up. The common faults:

• No heating or hot water. Could be a failed diverter valve, a faulty pump, a broken thermostat or controls, or a lockout — the boiler stops itself when it detects a problem.
• Low pressure. A combi boiler needs system pressure (usually around 1–1.5 bar cold). A gauge near zero points to a leak somewhere in the system, a failed expansion vessel, or a recently bled radiator. Topping it up is a short-term fix; if it keeps dropping, an engineer will work through the likely sources in turn — the expansion-vessel charge, the pressure-relief (PRV) discharge pipe outside, visible radiator valves, and hidden pipe routes — before concluding the boiler itself is leaking.
• A fault code or lockout. Modern boilers show a code on the display. It narrows the cause — ignition, fan, flow, pressure, sensor — but clearing it without fixing the underlying fault just sends it straight back into lockout. Our boiler fault codes guide explains the common ones.
• Ignition or pilot-light failure. The boiler tries to fire and fails, or won’t stay lit — often a gas-supply, ignition-lead or flame-sensor issue, all of which are Gas Safe work.
• Kettling, banging or gurgling. A rumbling like a kettle usually means limescale or sludge build-up in the heat exchanger — particularly relevant on Havering’s hard water (more below).
• A frozen condensate pipe. A common cold-snap callout: the boiler locks out (often with a specific code) because the plastic condensate pipe outside has frozen. It can sometimes be thawed by pouring warm — never boiling — water along the external pipe, but if you’re unsure, or it keeps recurring, an engineer can fix the lockout and advise on lagging or re-routing the pipe.
• A leaking boiler. Water inside or under the casing is never a “leave it” fault — it can damage the PCB and is a reason to turn the boiler off and call an engineer.

Because the boiler is a gas appliance, the diagnosis and repair must be done by a Gas Safe registered engineer — the HSE requires that anyone working on gas appliances in domestic premises is Gas Safe registered and competent in that work.¹ Work on the gas valve, burner, fan and anything combustion-related is not DIY and needs an engineer holding the correct Gas Safe appliance category.

Repair or replace?

Most boiler faults are a repair — a pump, a diverter valve, an expansion vessel, a PCB or a sensor — and on a boiler that’s only a few years old, repair is almost always the right call. One thing worth checking first on a newer boiler: if it’s a recent installation (common in new-build areas like Beam Park), it may still be under manufacturer warranty — using the warranty repair route can save you paying privately, though warranties usually require up-to-date servicing records and an approved engineer, so check the terms before you book.

The calculation shifts towards replacement when:

• the boiler is old (roughly 12–15 years or more) and parts are getting hard to source;
• the repair cost is creeping towards a significant fraction of a new boiler;
• it’s breaking down repeatedly, each fault chasing the last;
• or efficiency has dropped far enough that a new boiler would noticeably cut running costs.

If you do replace, it’s worth knowing what a new boiler must meet. Under the government’s Boiler Plus standard, in force in England since April 2018, a new or replacement gas boiler must be at least 92% ErP efficiency, must have time and temperature controls, and a new combi boiler must include one additional efficiency measure (such as weather or load compensation, flue gas heat recovery, or smart controls).² A new boiler is a job for Boiler Installation; our boiler repair or replace guide and combi vs system boiler guide help you weigh it up.

Hard water and Havering boilers

There’s a local angle that matters for boilers here. Many Havering homes are on a hard-water supply, including Essex & Suffolk Water’s hard-water area, where the company confirms hardness leaves limescale.³ In a boiler and its heat exchanger, scale (alongside sludge from corrosion in the wider system) is a common cause of kettling, reduced efficiency and recurring faults — the boiler has to work harder to push heat through a furred or sludged-up exchanger.

It’s why a Gas Safe engineer working on a Havering boiler will often look at system protection as part of the fix: checking or fitting an inhibitor, advising on a system flush or power-flush where sludge is the underlying problem, and sometimes a scale reducer on the incoming main. Treating the cause, not just the symptom, helps prevent the same fault returning the following winter.

Safety first

A boiler is a gas appliance, so the safety points here aren’t a formality — they’re the reason gas work is restricted to registered engineers in the first place.

Only a Gas Safe registered engineer should work on your boiler. The Gas Safe Register is the official register of engineers legally allowed to carry out gas work in the UK; it replaced CORGI in 2009, and registration is a legal requirement under the Gas Safety (Installation and Use) Regulations 1998.¹ A registered engineer carries a Gas Safe ID card showing the work they’re qualified to do — you’re entitled to ask to see it.

If you smell gas or suspect a leak, follow the Health and Safety Executive’s emergency sequence:

1. Don’t touch electrical switches — on or off — light a naked flame, or smoke.
2. Open doors and windows to ventilate, if it’s safe.
3. If you know where the gas meter control valve is and can reach it safely, turn the gas off at the meter (not if it’s in a cellar).
4. Leave the property if the smell is strong or you feel unwell.
5. Call the National Gas Emergency Service on 0800 111 999 from outside — free, 24/7. National Gas sets out this sequence and will send an engineer to make the situation safe.⁴

Carbon monoxide (CO) is the danger that makes a faulty boiler more than an inconvenience — it’s colourless, odourless, and produced when a gas appliance burns incompletely. Warning signs include headaches, dizziness, nausea or breathlessness that ease when you leave the house, and a lazy yellow or orange flame instead of crisp blue. If you suspect CO, get fresh air, call 0800 111 999, and seek medical help. Every home with a gas appliance should have a CO alarm that complies with BS EN 50291 and is sited per the manufacturer’s instructions.⁵

If you rent, your landlord is responsible for the boiler and gas appliances they provide, including an annual gas safety check by a Gas Safe registered engineer and a Gas Safety Record (still often called a “CP12”). The HSE sets out that gas safety duties for landlord-provided gas appliances, flues and pipework remain the landlord’s responsibility, with annual checks on the relevant gas fittings.⁶ So report a faulty boiler in a rented home to your landlord or letting agent.

Find a verified boiler engineer by district

Havering is an outer-London suburban borough, with many suburban houses alongside flats, maisonettes and newer developments — and the boiler picture reflects the local stock and its hard-water supply. Here’s the local picture.

Romford (RM1, RM2, RM7) — town-centre flats above shops and a wide spread of suburban housing in Gidea Park, Rise Park and Mawneys. Flats and maisonettes often have wall-hung combi boilers in a kitchen or cupboard; in a block, flue access, cupboard clearances and a fault that’s losing water and affecting the flat below can mean the engineer needs tenant, landlord or block-manager access before the repair can be completed.

Hornchurch & Elm Park (RM11, RM12) — many 1930s inter-war semis, bungalows and detached houses, a good number with older heating systems where sludge and scale build-up are a common underlying cause of boiler faults. Repeated lockouts here are often a system-protection problem, not just the boiler.

Upminster & Cranham (RM14) — larger suburban homes, more often with system or heat-only boilers and a hot-water cylinder rather than a single combi, which means more components (pumps, motorised valves, expansion vessels) that can be the real fault behind “no hot water.”

Rainham, South Hornchurch & Beam Park (RM13) — older mixed stock beside new-build Beam Park homes. New-builds usually have modern, efficient combi boilers that may still be under manufacturer warranty (worth checking before paying for a private repair); older stock more often has ageing boilers nearer the repair-or-replace decision.

Harold Hill, Harold Wood & Collier Row (RM3, RM5) — post-war estate housing, maisonettes and flats, mid-century houses and 1930s Collier Row stock. In flats and maisonettes, a wall-hung combi is the norm, and access for a flue or condensate route — sometimes running through an extension or shared fabric — can be a factor in the repair.

Gidea Park, Emerson Park & the rural edge (RM2, RM4) — larger detached houses, often with bigger or higher-output systems and sometimes more than one boiler. Some rural-edge properties out toward Havering-atte-Bower, Noak Hill, Corbets Tey and North Ockendon may be on oil or LPG rather than mains gas where the gas network thins out — worth confirming the fuel and system type before booking, and a verified engineer will check it before quoting.

If you’re near the Romford / Barking & Dagenham boundary at Rush Green, confirm your postcode is RM and within Havering before booking.

What it costs

The figures below are an editorial estimate only, to help you sense-check a quote — they are not regulated rates, not market data, and not a published cost survey. Always confirm the price before work starts, and see how to read a plumbing quote and our boiler repair or replace guide.

Havering is outside the central London Congestion Charge zone, but like every Greater London borough it sits inside the London-wide Ultra Low Emission Zone (ULEZ), which the TfL ULEZ scheme operates across all London boroughs (excluding the M25 itself). A non-compliant vehicle may incur the daily charge, so it’s reasonable to ask whether any emissions-zone charge is included in a quote.⁷

When you contact an engineer from this directory, you can ask about availability, the diagnostic/call-out charge, whether the part is included, and whether they’d recommend repair or replacement — you’re not obliged to proceed until you’ve agreed the next step. VerifiedPlumbers is a directory that connects you with verified, Gas Safe registered engineers; it doesn’t carry out the work itself.

Frequently asked questions

Related services in Havering

• Central Heating Repair in Havering — radiators not heating, when the boiler’s fine
• Boiler Installation in Havering — a new or replacement boiler
• Boiler Servicing in Havering — annual service and gas safety check
• Emergency Plumber in Havering — urgent no-heat or gas situations
• All plumbing services in Havering — the full directory

Related guides

• Boiler Repair or Replace? — how to weigh up the decision
• Boiler Fault Codes — what the common codes mean
• Combi vs System Boiler — the differences explained
• London Plumbing Costs & Compliance Guide 2026 — what plumbing and heating work typically costs

A boiler that’s stopped is rarely beyond a repair — most faults are a pump, a valve, a sensor or a pressure problem, and on a boiler under about a dozen years old, fixing it is usually the right call. The things that matter most are getting a Gas Safe registered engineer to do it, treating the hard-water scale and sludge that cause so many recurring Havering faults, and never ignoring a gas smell or signs of carbon monoxide. The verified engineers listed above repair boilers across the Havering RM postcodes listed above, each one Gas Safe registered for the gas work they carry out.

↑ Find a verified Havering boiler engineer — see the verified list above.

← Back to all plumbing services in Havering

Last reviewed: May 2026 by Adiel Khan — SFEDI-accredited business advisor, 20+ years’ experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. LinkedIn ↗

This page is checked for compliance and regulatory accuracy against the bodies and regulations cited on it — the HSE, the Gas Safe Register, the Gas Safety (Installation and Use) Regulations 1998, the National Gas Emergency Service, Boiler Plus (GOV.UK), Essex & Suffolk Water and Transport for London. Source links are provided within this page where relevant.

Sources & further reading

1. HSE — Gas safety (home owners) (anyone employed to work on gas appliances in domestic premises must be a Gas Safe registered engineer, competent in that area of gas work; registration is required under the Gas Safety (Installation and Use) Regulations 1998). https://www.hse.gov.uk/gas/domestic/faqownerocc.htm
2. GOV.UK — Boiler Plus factsheet (new/replacement gas boilers in England from April 2018 must be at least 92% ErP, with time and temperature controls; new combi boilers need one additional efficiency measure). https://assets.publishing.service.gov.uk/media/5b2cc1e2ed915d586e2d8fe9/Boiler_Plus_Factsheet_v3.pdf
3. Essex & Suffolk Water — Hard water (confirms a hard-water supply area; limescale forms from hard water). https://www.eswater.co.uk/hardwater
4. National Gas — Emergency contacts (gas-emergency sequence; 0800 111 999, 24/7). https://www.nationalgas.com/emergency-contacts
5. HSE — Domestic gas frequently asked questions (CO alarm to BS EN 50291). https://www.hse.gov.uk/gas/domestic/faqs.htm
6. HSE — Landlords’ responsibility for gas safety (annual checks on landlord-provided gas appliances, flues and pipework). https://www.hse.gov.uk/gas/landlords/
7. Transport for London — Ultra Low Emission Zone (ULEZ operates across all London boroughs, excluding the M25; daily charge for non-compliant vehicles). https://tfl.gov.uk/modes/driving/ultra-low-emission-zone