The best gas boilers, compared.
Top pick: Camplux BW158BC 6 L with rain cap – Outdoor shower at £219.99 with its own UK review file, 4.4 from 518 ratings, and a rain cap in the box. Best value: Camplux AY132B 5 L portable – £150.44 with a 37 mbar regulator in the box and a flow figure that matches the 10 kW line. Updated 17.10.2026.
You searched for a gas boiler because the radiators or the hot water need replacing. A UK gas boiler for that job is a fixed condensing appliance: a combi, a system boiler, or a regular heat-only boiler. Three units are wall-mounted for home hot water. The other eight are portable or outdoor showers. That is not the price of these listings. If the house needs radiators, ask three Gas Safe registered engineers for quotes. The [gas boiler buying guide](/hub/hot-water/gas-boiler/sub/gas-boiler-buying-guide) sets out when this shelf is the wrong purchase. This page ranks the eleven heaters that are listed: fuel and pressure, stated flow, whether a fixed unit needs a Gas Safe install, and whether the star line is a shared review file. The three usual types are a combi, a system boiler, and a regular heat-only boiler. A combi has no cylinder and can struggle when two bathrooms run together. A system boiler needs a cylinder but not a cold loft tank. Which? points a one-bathroom flat toward a combi. Published kilowatt tables disagree, and many homes need under 10 kW for space heating, so the size is a heat-loss survey.
You searched for a gas boiler because the radiators or the hot water need replacing. A UK gas boiler for that job is a fixed condensing appliance: a combi, a system boiler, or a regular heat-only boiler.
38 products checked · 64 hrs invested · +22,800 readers
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Personal buying guide
Question 1 of 2
Where will it run?
The Camplux BW158BC is a 6 L/min, 12 kW outdoor propane or butane shower at £219.99, with a rain cap in the box. The included kit lists a propane regulator with a 150 cm hose, described as 37 mbar for a 27 mm clip-on, plus a shower head with a 150 cm hose. Ignition is 3 V, the weight is 5.1 kg, and the bullets tell you to drain residual water, though the spec block gives no minimum outdoor temperature. Across 518 amazon.co.uk ratings at 4.4, the first 50 review headers in the review file are United Kingdom, and this file is not the shared Gasland block. UK reviewers describe daily use for months, including dog washing, a family of six using it for three weeks during a bathroom renovation, and nearly a year of frequent use once the flame sensor was cleaned. One review reports an internal joint leaking on first setup, and the next day that unit would only give cold water. The flame sensor can shut the gas off until it is cleaned, and a reviewer who wanted a different bottle found the supplied regulator was for the collar in the bullets. For an outdoor shower with its own UK review file, this is the top pick in the set.
Pros
Cons
Best for: Outdoor showers, dog washing, and short renovation cover, where a rain cap and a matching 27 mm propane clip-on are what you need.
Less suitable: Radiators, a different cylinder collar, or a buyer who cannot accept a first-setup leak in the review file.
Specifications
Common questions
Can it be used in cold weather?
The listing asks that. The spec block does not give a minimum outdoor temperature. The bullets tell you to drain residual water.
Does it need batteries?
The voltage line is 3 V. The included list does not name batteries.
Is it for outdoor use?
Yes. The style is outdoor installation, and the box includes a rain cap. The bullets still say it is a propane or butane water heater, not a house boiler.
The Camplux BW528B is the largest outdoor unit in the set, at £379.99, with a claimed 20 L/min and 40 kW. The bullets name a 128 mm vent, a maximum of 85°C, and butane at 28–30 mbar or propane at 37 mbar with the matching regulator. Ignition is two D cells, there is no mains connection in the bullets, and the included list has the heater, a G1/2 water connector, an installation kit, and a shower head with a 150 cm hose, without a pump. The case is about 44 cm wide and 70 cm high, at 13.5 kg. Across 19 amazon.co.uk ratings at 4.4, four UK reviews in a file of 12 texts call it well built, describe a steady adjustable flow in a camper conversion, and mention off-grid hot water in a motorhome. One UK review says Camplux customer service let the buyer down. A Spanish review in the same small file says two buttons arrived broken and the seller replaced them. Nineteen ratings cannot support a house-boiler claim, and the seller’s figure of 40 percent energy saving in ECO mode is not a result we tested.
Pros
Cons
Best for: A large outdoor wall heater for a garden, RV, or tiny house, if you can live with 19 ratings.
Less suitable: A surveyed combi, a pump-fed bucket, or anyone treating 4.4 from 19 ratings as a large-sample test.
Specifications
Common questions
Can it be used in a caravan?
The title says garden shower, RV, and tiny house. UK reviews mention a camper and a motorhome. The bullets also say caravan, campsite, poolside, cabin, and barn.
What gas does it use?
Butane at 28–30 mbar or propane at 37 mbar, with the matching regulator. The gas nut is G1/2 inch.
Does it need mains electricity?
No. The bullets say two D cells and no mains.
The Gasland BG300NG is an indoor wall-mounted water heater at £178.49, listed for natural gas at 20 mbar, with 11 L/min and 22 kW on the same page. The bullets require professional installation and a 110 mm flue, with at least 50 cm of straight flue before a bend, and the included line is screws, so the flue is not in the box. The listing’s 4.2 from 947 ratings shares its review text with the GS318NG and the BG264, and only nine of the first 50 headers are United Kingdom. Inside that shared block, a UK note describes an 11 L unit that needed cupboard space in a mobile home in Wales, and another says a gas engineer looked at a unit used as a shower in an outdoor building. Shared complaints cover a flue the buyer could not find locally, spark failure unless the batteries are disconnected and reconnected while water is flowing, and a leaking gas valve with support described as silent. Those faults cannot be assigned to this ASIN alone, because the file also names a GS318NG and a portable camping setup. It is a mains-gas hot-water heater for a Gas Safe install, and the A+ cell is not an England Boiler Plus certificate.
Pros
Cons
Best for: A mains-gas tap supply at 20 mbar, where a Gas Safe engineer will fit the 110 mm flue the box does not include.
Less suitable: Radiators, a propane bottle, or anyone treating the shared 947-review file as a test of this model alone.
Specifications
Common questions
Can this be used in a small flat?
The listing asks that question. The bullets describe an 11 L/min natural-gas water heater for home use, with a 110 mm flue and professional installation. They do not say it heats radiators. Minimum water pressure is not stated.
Does it need professional installation?
Yes. The bullets say professional installation is required, with a 110 mm flue and at least 50 cm of straight flue before a bend.
What gas does it use?
Natural gas (methane) at 20 mbar only, on the title and the bullets. It is not the propane listing.
The Gasland GS318NG is the lowest-priced indoor listing in the set, at £151.99, for 12 L/min and 24 kW of natural gas at 20 mbar. The bullets include a 220–240 V cable, 150 cm long, and they recommend a licensed installer. The spec line lists low-water-flow protection, an LED display, error codes, frost protection, overheat protection, and flame detection. The efficiency cell says “Wysoki”, which is not an A–G ErP letter, and the spec block does not give a flue diameter. Its 4.2 from 947 ratings is the same shared file as the BG300NG and the BG264, so a one-line “easy to install” review is not a separate test of this model. One review in that block praises a GS318NG by name for home hot water, while another describes a portable camping setup that may belong to a different unit. Included components are not stated. The word “sealed” on the title does not make this a system boiler for radiators.
Pros
Cons
Best for: You want the lowest indoor shelf price for 20 mbar hot water, and a licensed installer will specify the flue.
Less suitable: Anyone reading “sealed” as a system boiler, or anyone who needs an ErP letter rather than the word Wysoki.
Specifications
Common questions
Does it come with a power cable?
The bullets say it has a 220–240 volt cable, 150 cm long.
Can it be wall mounted?
The mount type is wall, and the bullets describe a wall-mounted indoor unit.
What safety features are listed?
The spec line lists low-water-flow protection, an LED display, error-code indication, frost protection, overheat protection, and flame detection.
The Gasland BG264 is the indoor propane water heater at £249.99, listed at 10 L/min and 22 kW for 30/37 mbar LPG. Ignition is battery powered, and the bullets say a mains connection is not required. Professional installation and a 110 mm flue are required in the bullets, and the included components are screws. It weighs 9.98 kg and the listing states a 2-year warranty. The 4.2 from 946 ratings sits on the shared Gasland review file, and the image file name matches the natural-gas BG300NG. A bullet says battery ignition can suit a mobile home, which is seller wording rather than a park-home approval. Put it only on a 30/37 mbar propane supply, after a Gas Safe engineer has installed the flue that the box does not contain.
Pros
Cons
Best for: A 30/37 mbar propane supply for indoor hot water, with a Gas Safe install and a flue bought separately.
Less suitable: A mains-gas meter, or a buyer who thinks the shared photo with the BG300NG proves which gas is in the box.
Specifications
Common questions
Can it be used in a mobile home?
The listing asks that. A bullet says battery ignition avoids a mains connection and can suit a mobile home. That is seller wording, not a park-home approval.
Does it need mains electricity?
The bullets say the burner is propane and ignition is battery powered, so a mains connection is not required.
What is the maximum water temperature?
The spec block does not state a maximum water temperature.
The Gasland BE158BP60 is a portable propane shower at £183.99 with a stated 6 L/min and a 6 L 12 V pump in the box. Two D cells for ignition are not included, and neither is the 5–15 kg LPG cylinder. The spec line lists 37 kW beside the 6 L/min bullet, and the pressure cells list both 30 millibars and 30,000 millibars, so the kilowatt figure cannot be read as a boiler output. Across 798 amazon.co.uk ratings at 4.1, UK reviews describe a van-door mount with fast hot water, an outdoor shower beside a hot tub, and a camper that got water well above 40°C. The same file calls the pump almost pressureless and says the heat kept climbing until it was described as scalding. One reviewer reported a pipe that burst inside after winter in a camper, even though they said they had drained it. A UK review also found the regulator and brass adaptors missing compared with the photo. It is an outdoor or van shower, and the freeze report is a reason to treat winter storage as a real risk.
Pros
Cons
Best for: A van or outdoor shower where a 12 V pump is in the box and you will drain it before a frost.
Less suitable: Winter storage in a camper, a buyer who needs a stable temperature, or anyone using the 37 kW cell as a boiler size.
Specifications
Common questions
Can it be used in a caravan?
The title and bullets name RV, camping, and caravan use. UK reviews describe van and camper mounting. That is not a statement that it is certified for a habitation gas system.
Does it need mains electricity?
Ignition is two D batteries, not included. The pump is 12 V. A mains connection is not listed.
Is the gas cylinder included?
No. The bullets say a 5–15 kg LPG cylinder is not included.
The Camplux AY132B is the lowest shelf price in the set, at £150.44, for a portable propane shower listed at 5 L/min and 10 kW. The box includes a 37 mbar regulator with a 150 cm hose, an installation kit, a shower head with a 150 cm hose, and two water connectors. Ignition is 3 V DC, the stated maximum water temperature is 65°C, and the case is about 29 cm wide by 37.6 cm high at 4.54 kg. Across 201 amazon.co.uk ratings at 4.1, UK reviews use it as a horse wash and describe it running from a camper door with the opening clear. One reviewer found it powerful enough that they turned the temperature down. A flimsy plastic connector between the hose and the shower head cracked, another unit failed after storage, and a buyer had to change the supplied regulator to fit the bottle they already had. The gas-pressure cell says 7.5 bar, which reads as a water figure beside the 37 mbar regulator in the box. It is the best value in this set when the job is a portable outdoor shower and you can match the regulator.
Pros
Cons
Best for: A portable horse wash or camper-door shower at the lowest shelf price, if the 37 mbar regulator matches your cylinder.
Less suitable: A house that needs radiators, a buyer who needs a rain cap, or a cylinder collar the supplied regulator does not fit.
Specifications
Common questions
Can it be used while camping?
Yes. The title says outdoor shower, camping, RV, and horse bathing.
Does it need mains electricity?
The voltage line is 3 V DC. Mains electricity is not listed.
What safety shutoffs are listed?
The bullets name flame-failure protection, overheat protection, and an oxygen-depletion shutoff, plus a drain plug.
The Gasland G10 Pro is the pump version of the same outdoor range, at £199.99, with bullets for 10 L/min and 20 kW. The title allows butane at 28–30 mbar or propane at 37 mbar, and the included line says Pump. The bullets say two D batteries are not included, and the voltage line is 3 V. The depth field shows 330.2 mm, which matches the bullet width rather than a separate depth. Weight on the spec line is 11.9 kg, and the listing states a 2-year warranty. The 4.0 from 328 ratings, and the bestseller rank, match the G10 file, and the review text is shared with the 3 L/min G3 Pro. A 3 L/min sentence in that shared file is not this listing’s flow. Choose it when you need the pump the plain G10 does not list, and treat the star line as one shared file rather than a second test.
Pros
Cons
Best for: You specifically want the pump the plain G10 does not list, on 28–30 mbar butane or 37 mbar propane.
Less suitable: Anyone who wants a separate UK test of a 10 L/min heater, or who has not bought two D batteries.
Specifications
Common questions
Does it come with a water pump?
Yes. Included components says Pump, and the title says with water pump.
Can it be used with butane?
The title says butane at 28–30 mbar or propane at 37 mbar.
Are batteries included?
The bullets say two D batteries are not included.
The Gasland G10 is a portable outdoor LPG heater at £167.99, titled for butane at 28–30 mbar or propane at 37 mbar. The bullets claim up to 10 L/min and 20 kW, while the heat-output spec cell says 6,824 British Thermal Units, which is not the same claim. The included-components line is screws, the voltage line is 3 V, and batteries are not listed in the box. The spec weight is 9.1 kg, and the bullets describe a folding handle and a case of about 330 x 150 x 470 mm. The 4.0 from 328 ratings is a review file shared with the G3 Pro and the G10 Pro. One UK review in that file describes a 3 L/min unit, so that sentence must not be used as this model’s flow. A 2-year warranty is on the listing, and the part-number field is the word Update. Use it as an outdoor shower only if you already own a matching regulator and you set aside the conflicting heat cell.
Pros
Cons
Best for: An outdoor LPG shower only if you already own a matching regulator and you ignore the 6,824 BTU cell.
Less suitable: A reader who takes the shared 3 L/min review as this model’s flow, or who expected a regulator in the box.
Specifications
Common questions
Can it be used with butane?
The title says butane at 28–30 mbar or propane at 37 mbar.
Does it need batteries?
The voltage line is 3 V and the bullets describe battery ignition. The included line does not list batteries.
Is it easy to carry?
The bullets describe a folding handle and a size of about 330 x 150 x 470 mm. Weight on the spec line is 9.1 kg.
The Gasland G3 Pro is an outdoor propane or butane shower at £288.99, with a bullet flow of 3 L/min and a 6 kW output that agrees with that flow. The bullets say the burner stops at 50°C and restarts below 45°C, and the material field states 28–30 mbar butane or 37 mbar propane. Accessories in the bullets include a gas regulator, a water pump, a shower head, and a 12 V cable, with power from a 4,000 mAh battery or 12 V. Weight does not agree with itself: the spec line says 9.86 kg and a bullet says about 6.2 kg. The 4.0 from 327 ratings shares review text with the G10 and the G10 Pro, and only three of 34 headers in the file are United Kingdom. UK lines in that shared file describe a hot camping shower and an easy outdoor setup, including a 3 L/min comment that fits this model better than the 10 L listings. At £288.99 you are buying a small camping flow, and the file is not a separate house-boiler test.
Pros
Cons
Best for: A short camping shower at 3 L/min, if you accept £288.99 and a weight line that disagrees with itself.
Less suitable: A household that wants 10 L/min, or a reader treating the shared file as a unique test of this model.
Specifications
Common questions
Can it be used for camping?
Yes, on the title and bullets: camping, outdoor showers, car washing, and pet bathing.
Does it need mains electricity?
No. The bullets say a 4,000 mAh battery or 12 V DC input.
Is a pump included?
The bullets list a water pump among the accessories.
The Camplux Nano 3 Pro is a 3 L/min portable heater at £359.99, with a 12 V submersion pump in the box. The wattage line says 6 kW, while the heat-output field says “100 Degrees Celsius”, so that cell is not a power figure. Power is a 4,000 mAh battery or a 12 V cigarette-lighter cable, 500 cm long, and the bullets say charging power must be 12 V. The supplied regulator is a 27 mm propane clip-on with a 150 cm hose; the bullets allow butane only if you fit a different regulator. The stated water range is 28–50°C at a 22 K rise, and the case is about 17 cm wide. Across 194 amazon.co.uk ratings at 4.0, UK reviews praise a small camper after the regulator was changed, and one buyer used a replacement unit for a camping week after the first unit failed. Another unit stopped heating above about 14°C and would not charge from 12 V, and a shower-head clip was too weak to hold the head. Customer-service replies about spare parts were slow in one UK review, which is a lot of money for 3 L/min if the first unit has to be swapped.
Pros
Cons
Best for: A compact camper shower at 3 L/min, once the regulator collar matches and you have a 12 V supply.
Less suitable: A 21 mm cylinder used with the supplied 27 mm regulator, or a buyer paying £359.99 for a house boiler.
Specifications
Common questions
Can it be used with butane?
The bullets say propane or butane if you use the matching regulator. The regulator in the box is for a 27 mm propane clip-on, not for butane.
Does it come with a pump?
Yes. The included list has a 12 V submersion water pump.
Is it easy to set up?
The bullets describe battery or 12 V power, a pump, and a shower hose. UK reviews say the first home test was straightforward and that the regulator may still need changing.
We compared eleven instantaneous gas water heaters filed on amazon.co.uk. None is a combi, system, or regular boiler. The score uses the star line, review volume, whether the listing agrees with itself, the stated job, and the shelf price. A shared review file is not treated as a separate test. There was no laboratory test and no heat-loss survey. Deductions for a leak, a conflicting kilowatt cell, a thin sample, and similar faults sit outside the 100 points below.
Star rating
30%Up to 30 points from the amazon.co.uk star line: stars divided by five, times 30. The editorial score is not the star rating times 20.
Review volume
20%Up to 20 points from the rating count. A review file shared with other ASINs is capped, so a large shared count does not win an award on its own.
Listing consistency
20%Up to 20 points when fuel and pressure are named without a second conflicting gas figure, flow and kilowatts describe the same appliance, and a regulator, shower, or pump is actually in the box.
Stated job
15%Up to 15 points for the job the listing actually states. An indoor unit with a named flue and a professional-install line scores above a screws-only portable. Nothing scores full marks, because nothing heats radiators.
Shelf price
15%Up to 15 points from the captured amazon.co.uk shelf. Under £160 scores highest in this set. £300 and above scores lowest. The bands are these listings, not a market survey.
A gas boiler for radiators is a surveyed combi, system, or regular boiler. The eleven amazon.co.uk listings here are instantaneous gas water heaters, from £150.44 to £379.99. Three are indoor flued Gasland units. Eight are portable or outdoor LPG showers. Use the notes below to see which job you actually have, then match fuel, flow, and who may install a fixed unit. Prices are captured shelf prices, not a live check.
A UK gas boiler that heats radiators is a fixed condensing appliance. The three usual types are a combi, a system boiler, and a regular heat-only boiler. A combi has no cylinder and can struggle when two bathrooms run together. A system boiler needs a cylinder but not a cold loft tank. A regular boiler needs both. Which? points a one-bathroom flat toward a combi. Published kilowatt tables disagree, and many homes need under 10 kW for space heating, so the size is a heat-loss survey.
These eleven listings are instantaneous gas water heaters. A combi, a system boiler, and a regular boiler are a different purchase. None of the kept pages says it feeds radiators.
BG300NG and GS318NG are 20 mbar methane only. BG264 is 30/37 mbar propane. Portables are typically 37 mbar propane or 28–30 mbar butane. The regulator has to match the cylinder.
Several indoor boxes list screws, not a flue. BG300NG, GS318NG, and BG264 share review text. An A+ cell, or the word Wysoki, is not an England Boiler Plus certificate.
Radiators need a surveyed combi, system, or regular boiler. None of these listings says it feeds a heating circuit. A published kilowatt table is not a heat-loss survey. If the job is taps or an outdoor shower, stay with these eleven heaters. Fuel comes next. BG300NG and GS318NG are 20 mbar methane only. BG264 is propane at 30/37 mbar. Portables are typically propane at 37 mbar and butane at 28–30 mbar. Liquid Gas UK notes that some caravans use 30 mbar for both.
Fixed gas work in a home, including the appliance and the final connection, is for a Gas Safe registered engineer. HSE allows a non-registered person to do wet work on pipes and radiators, not the appliance, and a registered engineer must not sign off unregistered gas work. The BG300NG bullets require a 110 mm flue, and the box contains screws. The GS318NG does not state a flue diameter. Use each listing’s own Customer Reviews line.
Three typical situations, each with a recommendation from this comparison.
The home is on natural gas at 20 mbar and you want a wall-mounted water heater, not radiators. The Gasland BG300NG is listed at £178.49, 11 L/min and 22 kW, and the bullets require a Gas Safe install and a 110 mm flue that the box does not include. The shared 4.2 from 947 ratings is not a test of this model alone.
There is no mains-gas meter, and the supply is propane at 30/37 mbar. The Gasland BG264 is the indoor propane listing at £249.99, 10 L/min and 22 kW, with battery ignition. The flue is not in the box, and the review text is shared with the natural-gas Gasland units.
You want an outdoor or portable LPG shower, not a heating boiler. The Camplux BW158BC is the top pick at £219.99: 6 L/min, a rain cap, and 4.4 from 518 ratings in its own UK review file. Match the 37 mbar regulator to the cylinder, and drain it before a frost.
The Camplux BW158BC is the top pick in this set for an outdoor shower: £219.99, 6 L/min and 12 kW, a rain cap in the box, and 4.4 from 518 amazon.co.uk ratings in its own UK review file. It is not a combi. The Camplux AY132B is the best value at £150.44, with a 37 mbar regulator in the box and a 5 L/min flow that matches the 10 kW line. The cheaper indoor GS318NG loses that award because its reviews are shared and the box contents are unstated. If you need radiators, neither award is a heating boiler.
Camplux BW158BC 6 L with rain cap
Outdoor shower at £219.99 with its own UK review file, 4.4 from 518 ratings, and a rain cap in the box.
Camplux AY132B 5 L portable
£150.44 with a 37 mbar regulator in the box and a flow figure that matches the 10 kW line.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources and the eleven amazon.co.uk listings, last checked on 17 October 2026.
This page contains affiliate links. If you buy through them, we may earn a commission at no extra cost to you. The notes use amazon.co.uk listings and public UK sources, not a laboratory test.
