Let’s face it — if you’re Googling this, it’s probably because your boiler’s either on its last legs… or already given up.

The first question we get when someone calls us at EPM is:

“How much does a new boiler actually cost?”

And fair enough. It’s not a small purchase, and there’s a lot of conflicting info online — prices from five years ago, “too good to be true” offers, and no one giving you the full picture.

So in true EPM fashion, we’re laying it all out — honestly, transparently, and with 2025 figures based on real jobs we do across Exeter and the South West.

💡 Short Answer: What’s the Average Boiler Installation Cost in 2025?

Boiler Type

Typical Cost (Supply + Install)

Combi Boiler (Straight Swap)

£2,200 – £2,800

System Boiler (Swap with New Cylinder)

£2,800 – £4,000+

Back Boiler Conversion to Combi

£3,500 – £5,000

New Full System (No Existing Boiler)

£4,000 – £6,500+

These are average prices — the exact cost depends on your home, system complexity, and choice of boiler.

What Affects the Cost of a Boiler Installation?

Let’s break it down. These are the biggest factors that shift the price up or down:

1. Boiler Type

• Combi boilers are usually cheapest to install — no cylinder or loft tanks

• System boilers cost more due to the hot water tank and pipework

• Back boiler conversions involve removing old units from behind fireplaces, which adds time and labour

2. Your Existing Setup

• A like-for-like swap is always simpler and cheaper

• Upgrading from an old gravity-fed system? That involves:

  • New pipework

  • Possibly removing tanks from the loft

  • Pressure testing the system

  • Changing radiators (in some cases)

3. Size of Your Home

• More radiators = bigger boiler required = higher cost

• More bathrooms = might need a system boiler or a high-output combi

4. Brand & Model You Choose

We install a range of trusted brands — the most popular being:

Brand

Typical Installed Cost (Combi)

Ideal

£2,200 – £2,600

Worcester Bosch

£2,400 – £2,900

Vaillant

£2,500 – £3,000

All of these come with strong warranties (usually 7–12 years), and we’re certified to install them.

5. Extras That Add Value (and Cost)

• Magnetic filters to protect your system: +£100–£150

• Smart thermostats (Hive/Nest): +£150–£250

• Powerflush (if needed): +£300–£500

• Upgraded controls or zoning: varies

We always explain whether these are needed, recommended, or just optional upgrades.

Watch Out for “Too Good to Be True” Boiler Prices

We’ve all seen the ads — “New boiler fitted from just £1,499!”

And while that sounds great, we’ve come across plenty of these jobs afterwards… and it’s not pretty.

We've seen:

• Boilers installed without proper flue clearances

• Incorrect pipe sizing (leading to poor performance)

• Cheap plastic fittings used where copper should be

• Pipework so messy it looks like a DIY project gone wrong

Often the installations are rushed, the workmanship is questionable, and corners are cut just to hit a low price point. You might not even get proper warranty registration or a Gas Safe certificate.

It might save you a few hundred up front — but it could cost you thousands later in repairs, inefficiencies, or having to rip it all out and start again.

At EPM, we believe in doing it once, and doing it properly. Your safety and the long-term performance of your heating system aren’t worth gambling on.

What’s Included in a Typical EPM Boiler Installation?

Here’s what we include as standard in every quote:

• Removal of old boiler

• Installation of new A-rated boiler

• Magnetic filter

• Flue upgrade (if needed for safety regs)

• System flush or clean

• Wireless thermostat (or smart upgrade option)

• Gas Safe certificate

• Warranty registration (some up to 12 years!)

No hidden fees. No guesswork. Just a full, transparent quote

Local Pricing, Not London Rates

We work across Exeter, East Devon, and the South West — not Central London.
Our pricing reflects local costs, local support, and local aftercare. You're not just a job number to us — we’ll be here if you need help 6 months or 6 years later.

Final Thoughts from EPM

Installing a new boiler is one of the most important upgrades you can make in your home. It’s not just about heat — it’s comfort, reliability, and peace of mind.

Whether you go with a combi or system boiler, cheap or premium brand, what matters is:

• It’s sized right for your home

• It’s installed safely and professionally

• You’re not left in the dark about the costs

If you’re in Exeter or nearby, give us a call. We’ll pop round, take a proper look, and give you a clear, written quote — no pressure, no sales pitch.