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Best LPG Combi Boilers


LPG boilers are perfect for off-grid homes or caravans. But which is the
best LPG boiler and why?


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Best LPG Combi Boilers

Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: March 14, 2024. Updated: March 14, 2024

An LPG combi boiler is one of the best alternatives to a mains gas combi boiler, especially if you live off the gas grid or in a static caravan where a gas meter cannot be installed. Read this guide before getting a boiler quote.

A frequent question is, which fuel is better, LPG or oil? Our guide, LPG vs Oil, digs into the details, but in short, it truly depends on your circumstances. LPG is cheaper to install, but oil is more affordable to run because the fuel is cheaper.

Best LPG Combi Boiler Overview

Our top 5 best LPG combi boilers: Viessmann Vitodens 100-W, Viessmann Vitodens 050-W, Worcester Bosch 4000, Alpha E-Tec Plus NX, Vaillant ecoTEC plus.

These 5 boilers have good warranties, which means they’ll have a long life. They’re known for quality and reliability, and although there are definite winners, all 5 are great boilers.

Best LPG Combi Boiler: Viessmann Vitodens 100-W LPG

Viessmann Vitodens 100-W 26kW LPG Combi Boiler - Best LPG Combi Boiler

Viessmann Vitodens 100-W 26kW LPG Combi Boiler – Best LPG Combi Boiler in the UK.

Price: from £1,430 inc. VAT (boiler only)
Price fully installed: approximately £2,900 inc. VAT

The Viessmann Vitodens 100-W is a wall-mounted gas and LPG condensing combi boiler. Changing to LPG is as simple as changing a setting with the whole Vitodens range.

It combines efficiency, durability, and user-friendly operation. This low-emission boiler will last you for 12 years minimum, and ensure you’re warm every step of the way.

Key Features:

  • High-quality stainless steel Inox-Radial heat exchanger
  • 94% efficient / A rated
  • Quietest LPG combi boiler in the UK at 34db
  • Compact dimensions, only 400 mm wide (more room required for servicing)
  • Pressure Release Valve and Condensate are combined foreasy installation
  • Easy to operate with a 5-inch colour touchscreen
  • Available as a system and regular boiler as well
  • System boiler: Cascade with up to six boilers up to 594 kW possible
  • Environmentally responsible MatriX cylinder burner
  • Optional remote fault notifications for Viessmann trained installer
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2nd Best LPG Combi Boiler – Viessmann Vitodens 050-W LPG Combi Boiler

Price: from £1,050 inc. VAT (boiler only)
Price fully installed: approximately £2,670 inc. VAT

Viessmann’s entry-level 050-W model is anything by mid-range. This boiler is a premium boiler with only a few downsides compared to it’s bigger brother the 100-W.

It has the same stainless steel heat exchanger and many of the same components. It has a 10-year warranty, rather than 12, a smaller touchscreen and smaller modulation range (1:8).

Key Features:
  • Ultra-compact – just 700mm in height
  • Available in 25kW, 30kW and 35kW versions and in system and regular types
  • High-quality stainless steel Inox-Radial heat exchanger
  • 92% efficient / Class A rated for energy efficiency

3rd Best LPG Combi Boiler – Worcester Greenstar 4000 LPG

Price: from £1,450 inc. VAT (boiler only)
Price fully installed: approximately £3,130 inc. VAT

The Greenstar 4000 condensing LPG combi boiler from Worcester is ideal for apartments and properties with one bathroom. Its compact size means this combi boiler can be installed in several locations. Its also compatible with a choice of optional heating controls.

We didn’t put this boiler higher because it comes with an aluminium heat exchanger, rather than a stainless steel one. And it uses a mixture of plastic and composite parts internally which could be brass and copper. This just means there is more potential for it to go wrong.

Key Features:
  • ‘Quick Tap’ function helps reduce water use
  • Modulation range of 1:10
  • Quiet 45dB operation
  • Available in 25kW and 30kW
  • 92% efficient / Class A rated for energy efficiency
  • Available with intelligent/automatic pressure monitoring
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4th Best LPG Combi Boiler – Alpha E-Tec NX LPG Combi Boiler

Price: from £940 inc. VAT (boiler only)
Price fully installed: approximately £2,090 inc. VAT

The Alpha E-Tec NX LPG combi boiler has their latest thermoplastic-covered stainless steel heat exchanger, allowing efficiency of up to 94%. It’s compact and simple to use. It doesn’t have the integrated WiFi connection that Viessmann offers, which is why it’s at number 4 in our list. This is a good, mid-tier, simple LPG combi boiler.

Key Features:
  • Modulation range of 1:6
  • Available in 28kW and 33kW
  • 94% efficient / Class A rated for energy efficiency

5th Best LPG Combi Boiler – Vaillant ecoTEC Plus LPG Combi Boiler

Price: from £1,522 inc. VAT (boiler only)
Price fully installed: approximately £2,990 inc. VAT

The Vaillant ecoTEC Plus LPG combi boiler has the Quiet Mark because of its innovative design. It has a good modulation range and a long 10-year extended warranty. Unfortunately, the range of LPG power outputs is smaller than with other boiler manufacturers, which is why we’ve put this at number 5.

Key Features:
  • Modulation range of 1:6
  • Available in 32kW
  • 90% efficient / Class A rated for energy efficiency
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Save up to £590 PER YEAR on your heating bills.
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What are the best LPG combi boiler brands?

Our top 5 best LPG combi brands: Viessmann, Worcester Bosch, Alpha, Vaillant, Baxi.

Viessmann design and sell the best boilers available across LPG and natural gas in the UK. With stainless steel heat exchangers, integrated WiFi, good-looking boilers and great customer service and warranties, it’s easy to see why they’re number 1. A massive plus is that Viessmann boilers don’t require a conversion kit to accept LPG, it’s a simple boiler setting change.

Worcester is the UK’s biggest-selling boiler brand, especially for natural gas. They have large numbers of trained engineers and models available. They’re just let-down by their aluminium heat exchanger which will lose efficiency over the life of the boiler increasing heating bills. Our guide on Worcester vs Viessmann goes into this in greater detail.

Alpha is a relatively new entrant into the UK market but are a large brand from Europe. They’re known for being an affordable boiler brand that still includes a great stainless steel heat exchanger in their boilers.

Vaillant are known for their build quality and design. Their boilers last well, but only some of their models have stainless steel heat exchangers, which means we don’t put them top of our list.

Baxi has a small range of boilers that cover a wide range of power outputs. Their LPG combi boilers are all conversions of their gas range, giving a good range of options.

How do I choose a new LPG combi boiler?

Selecting the right LPG combi boiler involves considering more than just the price. Efficiency, size, quality, and long-term savings are crucial factors.

It’s also important to consider the availability of LPG fuel, as it’s not supplied via mains. You will need to check your local area for suppliers and their pricing.

Look for boilers that offer the benefits you want. Viessmann boilers have built in WiFi to allow the installer and manufacturer to remotely monitor them – great for the rare issue that may pop up. Prioritise fuel efficiency to ensure the greatest output from the fuel.

Choose a boiler that matches the size of your space to avoid waste and ensure it’s made from durable materials to prevent breakdowns.

Balancing these considerations will help you find an LPG combi boiler that meets your needs and budget effectively. If you need help, get an online boiler quote now and we’ll call you back to discuss your specific requirements.

Need a new LPG combi boiler?

If you need a new or replacement LPG boiler, get an online quote, and you’ll get an instant price.

But why choose Boilerhut:

  • Next day boiler installation.
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  • Finance options available for new boilers and central heating installation.
  • 10 to 12-year warranty on boilers.
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  • Fixed prices. No hidden extras.
  • Get up to three quotes for different-tier boilers.

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