--- title: A complete guide to motorhome LPG systems description: Understand motorhome LPG systems, compare refillable and exchange bottles, and learn the safety checks and UK gas installation rules that matter. image: https://camperbuyer.com/hubfs/lpg_exchange_cylinder.jpg --- Explore our world [![facebookmobile (Custom)](https://camperbuyer.com/hs-fs/hubfs/facebookmobile%20(Custom).png?width=26&height=26&name=facebookmobile%20(Custom).png)](https://www.facebook.com/camperbuyercom/) [![instgrammobile (Custom)](https://camperbuyer.com/hs-fs/hubfs/instgrammobile%20(Custom).png?width=26&height=26&name=instgrammobile%20(Custom).png)](https://www.instagram.com/camperbuyer) [![twittermobile (Custom)](https://camperbuyer.com/hs-fs/hubfs/twittermobile%20(Custom).png?width=26&height=26&name=twittermobile%20(Custom).png)](https://twitter.com/camperbuyer) [![Youtube](https://camperbuyer.com/hs-fs/hubfs/image%20(28).jpg?width=26&height=26&name=image%20(28).jpg)](https://www.youtube.com/@CamperBuyer) Contact us on [0800 975 2931](tel://+440800%20975%202931) ## [![](https://camperbuyer.com/hubfs/logo_top_blue_1%206a97bb_188x188.png) camperbuyer.com The UK’s largest buyer of motorhomes](https://camperbuyer.com) - [How it works](https://camperbuyer.com/how_it_works) - [Reviews](https://camperbuyer.com/testimonials) - [FAQ’s](https://camperbuyer.com/faqs) - [The Lounge](https://camperbuyer.com/blog) - [Woodgreen Charity](https://camperbuyer.com/woodgreen) - [Contact Us](https://camperbuyer.com/contact-us) ## [![](https://camperbuyer.com/hubfs/logo_top_blue_1%206a97bb_188x188.png) camperbuyer.com The UK’s largest buyer of motorhomes](https://camperbuyer.com) Toggle navigation - [Home](https://camperbuyer.com) - [FREE Valuation](https://camperbuyer.com/camper-valuation) - [How it works](https://camperbuyer.com/process) - [Feedback](https://camperbuyer.com/feedback) - [FAQ's](https://camperbuyer.com/faqs) - [The Lounge](https://camperbuyer.com/blog) - [Contact us](https://camperbuyer.com/contact-us) - [Woodgreen Pets Charity](https://camperbuyer.com/charity) [![facebookmobile (Custom)](https://camperbuyer.com/hs-fs/hubfs/facebookmobile%20(Custom).png?width=26&height=26&name=facebookmobile%20(Custom).png)](https://www.facebook.com/camperbuyercom/) [![twittermobile (Custom)](https://camperbuyer.com/hs-fs/hubfs/twittermobile%20(Custom).png?width=26&height=26&name=twittermobile%20(Custom).png)](https://twitter.com/camperbuyer) [![instgrammobile (Custom)](https://camperbuyer.com/hs-fs/hubfs/instgrammobile%20(Custom).png?width=26&height=26&name=instgrammobile%20(Custom).png)](https://www.instagram.com/camperbuyer) [![youtube](https://camperbuyer.com/hs-fs/hubfs/image%20(27).jpg?width=26&height=26&name=image%20(27).jpg)](https://www.youtube.com/@CamperBuyer) ![The easiest way to sell your campervan](https://camperbuyer.com/hs-fs/hubfs/smallbanner.jpg?width=952&height=181&name=smallbanner.jpg) Sell your campervan quickly and securely [Request a FREE Campervan Valuation ▶︎](https://camperbuyer.com/valuationform) Genuine online or verbal offer to purchase Excellent prices offered and paid No admin fees or hidden charges Friendly professional, no hassle service Instant cash or faster payment bank transfer ![camper](https://camperbuyer.com/hs-fs/hubfs/motorhomemobile2.png?width=500&height=269&name=motorhomemobile2.png) [VALUE MY MOTORHOME](https://27011453.hs-sites-eu1.com/camper-valuation?hsLang=en) Oct 31, 2026, 6:44:47 PM # A complete guide to motorhome LPG systems ![Picture of Ethan Grey](https://camperbuyer.com/hs-fs/hubfs/ethan_grey_casual_v3.png?width=50&name=ethan_grey_casual_v3.png) [Ethan Grey](https://camperbuyer.com/blog/author/ethan-grey) ![Featured Image](https://camperbuyer.com/hubfs/lpg_exchange_cylinder.jpg) [Back to blogs](https://camperbuyer.com/blog) Share this post: [mailto:?body=https://camperbuyer.com/blog/a-complete-guide-to-motorhome-lpg-systems](mailto:?body=https://camperbuyer.com/blog/a-complete-guide-to-motorhome-lpg-systems) A motorhome LPG system supplies gas for cooking, heating, hot water and, where fitted, an absorption fridge. The right setup depends on how you travel, but every system needs suitable equipment, clear ventilation and regular professional checks. Refillable is not automatically better, and an ordinary exchange bottle is not something you can safely refill yourself at a petrol station.   Most owners do not need to become gas engineers. You do need to recognise the main components, know where to turn the supply off and understand which jobs belong in a workshop. Gas is very useful when you are miles from an electric socket. It is less forgiving of guesswork.   How a motorhome LPG system works   LPG means liquefied petroleum gas. Inside the cylinder or tank, much of the fuel is stored as a liquid under pressure, with gas vapour above it. A habitation system draws off that vapour, rather than deliberately feeding liquid gas to the appliances. As gas is used, more liquid evaporates to replace it.   In a typical bottle installation, a flexible hose called a pigtail connects the cylinder to a pressure regulator. The regulator reduces the pressure to the level the appliances require. Fixed pipework then distributes the gas, usually through individual isolation valves. A changeover device, if fitted, lets two cylinders supply the system in turn. The Camping and Caravanning Club’s gas guide explains these arrangements in more detail. ![lpg\_winter\_motorhome](https://camperbuyer.com/hs-fs/hubfs/lpg_winter_motorhome.jpg?width=1600&height=900&name=lpg_winter_motorhome.jpg) Propane or butane for a motorhome?   Both are LPG, but propane is usually the practical choice for winter touring. Butane becomes poor at supplying vapour as temperatures approach freezing. A bottle can still contain liquid fuel while being unable to supply enough gas for the appliances. That is not necessarily a faulty heater.   Autogas used in refillable systems can be a mixture of propane and butane, with the composition varying by location and season. A tank filled during warmer weather may not perform as well in severe cold as you expect. Check your appliance manufacturer’s advice before a winter trip; Truma’s winter gas guidance explains why the mixture matters. Never try to improve gas delivery by heating a cylinder with a flame or an improvised heater.   Why the correct regulator matters   Most modern UK motorhome habitation systems operate at **30 mbar**, meaning 30 millibar. Older installations may use 28 mbar for butane or 37 mbar for propane, and some imported vehicles have different specifications. The gas locker label, appliance data plates and vehicle handbook matter more than the age somebody guesses your motorhome to be.   A regulator intended for a barbecue is not automatically suitable for the motorhome. Nor should you add another regulator simply because a foreign bottle has a different connection. Have the correct cylinder connection, pigtail, regulator pressure and supply capacity confirmed for your installation. Changing bottle type is not a reason to start experimenting with the appliance pressure. ![lpg\_exchange\_cylinder](https://camperbuyer.com/hs-fs/hubfs/lpg_exchange_cylinder.jpg?width=1600&height=900&name=lpg_exchange_cylinder.jpg) Exchange gas bottles: simple and familiar   With an exchange system, you return an empty bottle to a stockist and collect a full one. Suppliers such as Calor and Flogas offer several cylinder sizes and connection types. Check the gas label rather than relying on cylinder colour, and make sure the bottle fits the locker with its valve and hose connected. Many exchange cylinders remain the supplier’s property under a cylinder agreement.   Exchange bottles often make sense for occasional UK trips, particularly if you use little gas and have convenient stockists. The drawbacks are lifting the bottles, finding the right size in stock and arranging gas abroad, where a UK cylinder may not be exchangeable. You are paying for a convenient supply system as well as the fuel. There is nothing outdated about choosing it if it suits your trips.   Refillable cylinders and fixed LPG tanks   A purpose built refillable cylinder stays with you and is replenished through its approved filling arrangement. A properly installed fixed cylinder system commonly uses a separate filler accessible from outside the motorhome. The filling connection and the outlet supplying the appliances perform different jobs. Suitable refillable equipment has automatic overfill protection, normally stopping the liquid fill at **80% of the vessel’s internal capacity**, leaving room for expansion.   An underslung tank is another option, mounted beneath the vehicle rather than occupying the bottle locker. It can offer useful capacity, but adds installation cost and weight. Mountings, protection from road damage, corrosion, ground clearance and access for inspection all matter. Buy a complete installation suited to habitation gas supply, not simply a tank that happens to fit underneath.   Can you refill any gas bottle at an LPG pump?   No. Never refill an ordinary exchange cylinder yourself. An online adaptor does not turn it into an approved refillable system. Calor’s warning about cylinder refilling describes fires, serious burns and prosecutions associated with this practice. Exchange cylinders must go through the supplier’s authorised filling process.   Portable cylinders specifically designed for refilling are a separate category, but they are not accepted everywhere. Liquid Gas UK’s forecourt guidance distinguishes these from vehicle attached vessels that remain in place, have physical overfill prevention and use a separate fixed filling connector. For a portable refillable, use filling locations confirmed by its supplier and the site operator as suitable for that exact cylinder. Being approved for refilling does not mean being approved at every pump. ![lpg\_refillable\_filler](https://camperbuyer.com/hs-fs/hubfs/lpg_refillable_filler.jpg?width=1600&height=900&name=lpg_refillable_filler.jpg) Is a refillable system worth buying?   Refillable gas can cost less per refill, but the equipment and installation must earn back their purchase price through the gas you actually use. Frequent touring without mains electricity may justify it. A few summer weekends with electric heating, hot water and refrigeration may not. Compare local refill and exchange prices, installation costs and future inspection or replacement costs before deciding.   Availability can be more important than price. Check that usable LPG filling locations exist on your normal routes and confirm their current service and acceptance policy before travelling. For European trips, obtain the filling adaptors specified for your system and destinations. Follow both the equipment instructions and forecourt rules, switch off the engine and gas appliances before filling, and never bypass the automatic fill stop to squeeze in more fuel.   How much gas should you carry?   There is no dependable rule that one bottle lasts a certain number of days. Heating a motorhome through a cold night is very different from boiling a kettle on a summer afternoon. Use your appliance manuals and experience of similar trips to estimate consumption. Automatic changeover is convenient, but check which bottle is supplying gas or you can discover that both are empty rather than just one.   For removable exchange cylinders, weighing and subtracting the correct empty cylinder weight can help establish the remaining gas. A pressure reading is not a reliable fuel gauge while liquid LPG remains. Remember that the bottle’s advertised gas capacity is not its total loaded weight: the container, gas and added equipment all affect your payload and axle loads. Also remember that many gas appliances still need electrical power for controls, ignition or fans. A full cylinder will not rescue a Truma Combi heater from a missing 12 volt supply. ![lpg\_hose\_inspection](https://camperbuyer.com/hs-fs/hubfs/lpg_hose_inspection.jpg?width=1600&height=900&name=lpg_hose_inspection.jpg) Gas safety checks before every trip   These are visual and operational checks, not permission to dismantle the system. Work from the vehicle handbook and keep the gas locker available for its intended purpose rather than treating it as spare storage.   Make sure removable cylinders are upright and properly restrained, with the locker secured. Keep the locker’s gas drop openings and the motorhome’s permanent ventilation unobstructed. Look for visible hose damage, chafing, severe bends or fittings being strained by stored items. Check accessible cylinders and tank mountings for damage or significant corrosion without disturbing connections. Keep appliance flues and external vents clear, and follow instructions about removing any operating covers. Test the smoke and carbon monoxide alarms as their instructions require, and check their replacement dates. Make sure everyone travelling with you knows where the main gas shutoff is.   LPG vapour is heavier than air, which is why low level escape routes matter. The gas locker should separate stored gas from the living space and provide the ventilation required by its design. Do not block openings to stop a draught or drill new holes through the locker without proper assessment. When changing a cylinder, follow the supplier’s connection instructions exactly, with the supply closed and no ignition sources nearby. Any connection check should use the specified method and suitable LPG leak detection fluid, never a flame.   What to do if you smell gas   Treat a gas smell as a reason to stop using the system, not an invitation to investigate with a screwdriver. LPG has an added odour to help reveal leaks. You do not have to locate the fault before taking action.   Get everyone out of the motorhome and away from the affected area. Do not smoke, light flames, start the engine or operate electrical switches or devices nearby. If it is safe and readily accessible, close the cylinder valve or designated tank shutoff. Open doors and windows if you can do so safely, without delaying evacuation. From a safe location, contact your LPG supplier’s emergency service. Call **999** if there is fire or immediate danger, and tell the operator that LPG is present.   Do not dismantle valves, move a leaking cylinder as a home repair exercise or repeatedly turn the supply back on to see whether the smell returns. Keep the system isolated until a suitably qualified person has made it safe. Calor’s emergency advice sets out the precautions for its customers; keep your own supplier’s emergency details with your vehicle documents. ![lpg\_carbon\_monoxide\_alarm](https://camperbuyer.com/hs-fs/hubfs/lpg_carbon_monoxide_alarm.jpg?width=1600&height=900&name=lpg_carbon_monoxide_alarm.jpg) Carbon monoxide is a different danger   A gas leak and carbon monoxide are not the same problem. Carbon monoxide, or CO, can be produced by incomplete combustion and **cannot be detected by smell**. Fit an audible CO alarm explicitly suitable for motorhomes, with certification to BS EN 50291 part 2, and follow its vehicle installation, testing and replacement instructions. A CO alarm does not normally detect leaking LPG, and an LPG detector does not replace a CO alarm.   Never use the hob or oven as a space heater, or bring a barbecue inside the motorhome or awning. If a CO alarm activates, or you suspect exposure, get everyone into fresh air immediately and do not return until advised it is safe. The NHS advice on carbon monoxide poisoning lists headache, dizziness, nausea and confusion among the symptoms. Seek medical advice promptly; call **999** for serious symptoms such as breathing difficulty, sudden confusion or collapse. Do not assume an alarm is faulty because you feel fine.   What an annual habitation gas check should cover   For a privately used motorhome, arrange a professional gas safety check annually as part of the habitation service. The inspection should cover gas tightness, regulator operation, visible pipework and hoses, cylinder security, ventilation and appliance operation. Ask what is included and obtain the written results rather than accepting “the cooker lit” as the entire assessment.   A habitation inspection is not necessarily a full service of every appliance. Burner cleaning, internal servicing and other manufacturer specified maintenance may need separate booking. The Caravan and Motorhome Club’s servicing advice makes this distinction clear. An MOT is not a habitation gas safety check, and a recent inspection does not override a gas smell or new fault that appears afterwards.   When should hoses, regulators and cylinders be replaced?   Do not apply one replacement age to every gas component. Hose type, markings, manufacturer instructions and condition matter. Liquid Gas UK’s hose guidance distinguishes tubing marked with an expiry date from hoses marked with a production date. Any visible damage or deterioration needs attention immediately, regardless of how young the component is. Have a specialist identify the correct interval for your particular hoses and regulator.   With exchange bottles, the supplier manages cylinder inspection through its filling process. With equipment you own, inspection and any required retest or replacement are your responsibility. Many refillable cylinders have a ten year retest or replacement requirement, but check the actual product rather than assuming every cylinder and fixed tank follows the same rule. When buying a used motorhome, ask for cylinder or tank dates, installation records and the maintenance history. ![lpg\_european\_fill\_adaptors](https://camperbuyer.com/hs-fs/hubfs/lpg_european_fill_adaptors.jpg?width=1600&height=900&name=lpg_european_fill_adaptors.jpg) Does every motorhome legally need a gas certificate?   A privately owned motorhome used privately does not automatically require an annual Gas Safe certificate under the gas safety regulations. In Great Britain, the Gas Safety Installation and Use Regulations 1998 exclude self propelled vehicles unless hired out in business or made available to the public through a business carried on from the vehicle. Northern Ireland’s separate regulations contain the same private vehicle distinction.   That is a distinction about the legislation, not a recommendation to skip maintenance. Annual professional checks remain sensible, and your warranty, insurance or hire agreement may impose further conditions. If you hire out the motorhome, the position changes: Gas Safe Register’s motorhome guidance explains the need for safety checks, servicing and a current Landlord Gas Safety Record. Do not assume an ordinary habitation inspection is sufficient for commercial hire; arrange the appropriate legal checks and records, normally on an annual cycle.   Who should install or alter motorhome gas equipment?   Use a suitably qualified specialist for a new installation, a refillable conversion, pipework alterations, appliance repairs or leak investigation. For a Gas Safe engineer, check that their current qualifications cover LPG and the relevant leisure accommodation vehicle work, not just household natural gas. An Approved Workshop is also a useful starting point for private motorhome maintenance; confirm the particular workshop can undertake the job you need.   The private vehicle exclusion means it would be inaccurate to say that all DIY motorhome gas work is automatically illegal. It does not make that work safe. Where the regulations apply, competence is required and gas businesses carrying out regulated work must be appropriately registered. For an owner, the practical boundary is straightforward: operate the system and change cylinders as instructed, but leave installation, alteration, servicing and fault finding to someone qualified for that specific equipment.   Which standards apply to LPG installations?   BS EN 1949 is the technical standard for LPG systems used for habitation in leisure accommodation vehicles. BS EN 721addresses safety ventilation. They are standards, not the same thing as the Gas Safety Installation and Use Regulations. Their subjects include the practical details that determine whether an installation is safe, from suitable equipment and gas storage arrangements to ventilation.   Ask an installer which applicable standards and manufacturer instructions the work follows, how the completed installation will be tested and what documentation you will receive. Keep that paperwork and tell your insurer about relevant modifications. An older motorhome does not automatically need rebuilding whenever a standard changes, but an old installation or later alteration still needs proper assessment. Age is not proof of safety, and neither is tidy looking pipework. ![lpg\_fridge\_ventilation](https://camperbuyer.com/hs-fs/hubfs/lpg_fridge_ventilation.jpg?width=1600&height=900&name=lpg_fridge_ventilation.jpg) Can you leave the gas on while driving?   The straightforward default is to **turn the gas off at the cylinders or designated tank shutoff before travelling**. Certain installations permit a suitable heater to operate in motion, but only with the correct complete safety arrangement and permission in the vehicle and appliance instructions. Truma’s crash sensor regulator guidance explains the role of a crash sensor and compatible hose rupture protection. Neither device detects every possible leak, and fitting one does not authorise every appliance to run while driving.   Ferries, tunnels and filling stations can impose stricter rules regardless of what your equipment permits on the road. Check the operator’s current requirements for shutting off gas, declaring cylinders and carrying fixed tanks before booking. Never leave a fridge or heater burning during refuelling, and do not confuse carrying LPG for habitation with using LPG to power the vehicle’s engine.   The sensible approach to motorhome LPG   Choose exchange bottles if they suit your gas use and travel routes. Choose a properly installed refillable system if its convenience and running costs justify the purchase. Whichever you use, know the correct pressure, keep the ventilation clear and stay on top of the inspection dates.   Before your next trip, find the main shutoff, test the alarms and check when the gas system was last inspected. If its history is missing, book a professional check before relying on it. A reliable LPG system should let you get on with the holiday, not leave you wondering whether the next strange smell is something to worry about.       *Subscribe to our newsletter and get the latest articles delivered straight to your inbo*x [![Subscribe](https://hubspot-no-cache-eu1-prod.s3.amazonaws.com/cta/default/27011453/interactive-363746868424.png)](https://camperbuyer.com/hs/cta/wi/redirect?encryptedPayload=AVxigLIbXUf8nx6zf%2Fa5iR4iQf6BH%2Bt8Hq6yFDiF1Ml07vf0phUJ9Ct0LbMOD3uoAkwVZCKNx6E0cKnLBKkjNtDQJSouFbw11CigqU0U%2FM6V2SYZrNMN870cdR9vphFHq9rI%2BrTiCI0EY0Fxirj7z%2BS0sScQv2b7JWfOMzlO36i9LMORr957243R9onND8Y%2BaF8%2BrPXA%2FlOovbZM&webInteractiveContentId=363746868424&portalId=27011453) ## Related posts [![](https://camperbuyer.com/hs-fs/hubfs/shutterstock_2346784107.jpg?height=200&name=shutterstock_2346784107.jpg)](https://camperbuyer.com/blog/the-rise-of-the-electric-motorhome-are-we-there-yet) ## [The Rise of the Electric Motorhome: Are We There Yet?](https://camperbuyer.com/blog/the-rise-of-the-electric-motorhome-are-we-there-yet) ![Picture of Siobhán Kelly](https://camperbuyer.com/hs-fs/hubfs/Siobh%C3%A1n%20Kelly.png?width=50&name=Siobh%C3%A1n%20Kelly.png) [Siobhán Kelly](https://camperbuyer.com/blog/author/siobh%C3%A1n-kelly) Jan 1, 2026, 1:29:49 PM The Electric Dream Hits the Road [Read more](https://camperbuyer.com/blog/the-rise-of-the-electric-motorhome-are-we-there-yet) [![](https://camperbuyer.com/hs-fs/hubfs/tempImagegDUAOw.jpeg?height=200&name=tempImagegDUAOw.jpeg)](https://camperbuyer.com/blog/food-is-a-universal-language) [Recipes](https://camperbuyer.com/blog/tag/recipes) ## [Campervan Cooking Adventures - Food is a universal Language](https://camperbuyer.com/blog/food-is-a-universal-language) [Michael from ChefCampers.com](https://camperbuyer.com/blog/author/michael-from-chefcampers-com) Jul 18, 2026, 9:12:03 AM Food is the World’s currency Living in a van for the past eight years has taught me plenty. 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