Online Boiler Companies vs Local Installers: Prices, Pros and Cons (2026)

Quick answer: Online boiler companies sell at a fixed price — from £1,790 installed at BOXT, £1,875 at Heatable and around £1,985 at iHeat (checked July 2026) — often with next-day fitting. Local Gas Safe installers quote after seeing the job; our modelled UK mid-point for a boiler replacement is £2,804, but local quotes vary widely.

A decade ago, replacing a boiler meant phoning around for surveys. Today around half a dozen national websites will sell you a fixed-price installation in minutes. That convenience is real — but so are the situations where a local engineer’s survey wins. This guide compares the two routes on price, flexibility, warranty and aftercare, using published data. For the full market picture, start with new boiler costs in 2026.

A note on independence: Home Energy Quotes has no commercial relationship with BOXT, Heatable, iHeat or any installer named here. We have not tested these services first-hand; company figures below come from their published prices, checked in July 2026.

How the fixed-price online model works

You answer a questionnaire about your home and current boiler — sometimes uploading photos — and an algorithm returns fixed prices for a shortlist of boilers. Pay, pick a date (often the next working day), and a vetted local Gas Safe registered engineer fits it. The price is guaranteed provided your answers were accurate. The engineers themselves are usually local professionals working through the platform’s network — often the same people you could hire directly.

How local installer quotes work

A local Gas Safe engineer or heating firm visits, inspects the system, flue and gas supply, and quotes for the specific job. The consensus advice is to collect two or three quotes. Prices are not standardised: the same swap can be quoted hundreds of pounds apart on the same street. Many local installers hold manufacturer accreditations that unlock extended warranties — some manufacturer schemes stretch cover beyond what the standard registration offers, which is worth asking about directly.

Price comparison

Sources: BOXT, Heatable and iHeat published prices · checked July 2026. Local figures are our modelled estimate — see how we calculate costs.

Region matters for both routes: on our regional cost index, London prices run around 20% above the national mid-point while the North East runs around 7% below. And remember these figures are for straightforward swaps — converting between boiler types costs more whoever does it (our combi vs system vs regular guide explains the difference, and the glossary covers the jargon).

Online installers: pros and cons

• Pro — certainty: the price is fixed before anyone visits, with no sales pitch in your living room.
• Pro — speed: next-working-day installation is standard where coverage allows.
• Pro — finance: 0% and long-term finance options are widely advertised, and warranties are registered for you.
• Con — the algorithm can’t see your home: mis-answered questions can mean revised prices or an aborted install on the day.
• Con — limited shelf: you choose from the brands and models each platform stocks.
• Con — remote aftercare: problems go through a national support team rather than the engineer who fitted the boiler.

Local installers: pros and cons

• Pro — accurate spec: a survey catches complications (flues, gas pipe upgrades, awkward access) before they become surprises.
• Pro — flexibility: any brand, any configuration, including conversions and relocations that online forms handle poorly.
• Pro — relationship: the person who fitted it services it; accredited locals can offer extended manufacturer warranties.
• Con — price variance: quotes differ widely, so you must invest time collecting several.
• Con — waiting: good local firms book up; next-day fitting is rare.
• Con — variable quality: vetting falls to you — check the Gas Safe register and recent reviews.

Safety and paperwork — non-negotiable either way

Whoever installs a gas boiler must be on the Gas Safe Register — it is a legal requirement, and you can check any engineer’s number free on the register. A compliant installation also needs Building Regulations notification (usually handled by the installer) and warranty registration with the manufacturer. If the boiler is part of a wider retrofit, our guide to TrustMark, MCS and PAS 2030 accreditations explains which badges matter for other measures.

So which route should you take?

There is no universal winner. For a straightforward like-for-like combi swap where speed and price certainty matter, the online platforms are hard to beat on convenience — and their quotes take minutes to get, so they make a useful benchmark even if you go local. For older systems, conversions, unusual flues or homes where the “right” boiler is not obvious, an in-person survey from one or two local firms is more likely to price the job accurately first time. Compare warranty terms and servicing arrangements, not just headline prices — and size the new boiler to the property using our boiler guide and savings calculator. Our best boiler brands 2026 comparison covers the manufacturers themselves.

FAQs

Are online boiler companies cheaper than local installers?

Often at the entry level — their fixed prices started at £1,790–£1,985 in July 2026, below our £2,804 modelled national mid-point for local work. But local quotes can undercut online prices on like-for-like jobs, particularly outside high-cost regions, so it pays to gather both.

Is the installation quality different?

Not inherently. Online platforms subcontract to vetted local Gas Safe engineers — often the same professionals you could hire directly. Quality depends on the individual engineer, so with either route check credentials and recent reviews.

What happens if a fixed online quote turns out to be wrong on the day?

If your questionnaire answers were accurate, the platforms guarantee the price. If the job differs from what you described, the price can be revised or the installation rebooked or refunded — the exact remedy is set out in each company’s terms, so read them before booking.