Commercial LPG heating: safety checks for sites off the gas grid

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Commercial LPG heating safety comes down to three things: a sound installation, regular checks by competent people, and clear arrangements between your business, your LPG supplier and your heating contractor. HSE puts it simply: when LPG "is stored and used in installations compliant with relevant health and safety legislation and industry codes of practice, it is a safe fuel. However, when it is not the results can be catastrophic." For a site off the gas grid that means knowing who owns the tank and the service pipework, having the boilers, heaters, flues and installation pipework maintained by a Gas Safe registered engineer who is qualified for LPG, keeping the area around the tank clear and secure, and knowing what to do if anyone smells gas. This guide sets out what UK guidance says, who is responsible for what, and what site teams should and should not do.

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Commercial heating tips and advice · 30 October 2026 · Fast Commercial Boiler Help, Gas Safe 985448

Why LPG needs particular care

HSE's guidance explains that LPG "can be obtained primarily as propane, butane or a mixture of the two" and that "A powerful odorant is added so that it is easily detected." The key difference from natural gas is weight: "LPG is flammable and heavier than air so that it will settle and may accumulate in low spots", such as basements, where it "could present a fire or explosion or suffocation hazard."

HSE's leaflet INDG428 adds that "An LPG leak can go unnoticed for some time and therefore vapour is more likely to accumulate, increasing the potential danger of a fire or explosion", and that the build-up "may be some distance away from the pipe." HSE's pipework replacement page records why this matters: in May 2004 a leak from a corroded buried pipe at a Glasgow plastics factory led to an explosion in which "nine people were killed and 33 were injured".

Commercial LPG heating safety: who is responsible for what

On a typical small bulk installation there are three parts, and they are often owned by different people. HSE's guidance on Safe use of LPG at small commercial and industrial bulk installations breaks it down like this:

The storage tank. "In the vast majority of cases the tank will be owned by the company that supplies the gas", and in general the supplier looks after the tank and its fittings. HSE still advises checking this with your supplier, "as legally it needs to be maintained in a safe condition." The site user keeps responsibilities for the tank's siting, ventilation and conditions around it, tanker access, security, impact protection and emergency arrangements.
The service pipework from the tank to the building. HSE says this "is most likely to be owned by whoever owns the premises using the LPG", which could be the landlord, and "is normally not owned by the LPG supplier, even though it may have been installed by them." INDG428 is blunter: if you don't know who owns it, ask your supplier, because "It's probably you!"
The installation inside the building: installation pipework, boilers, warm air and radiant heaters, water heaters and flues. Regulation 35 of the Gas Safety (Installation and Use) Regulations 1998 requires every employer or self-employed person to ensure that "any gas appliance, installation pipework or flue installed at any place of work under his control is maintained in a safe condition so as to prevent risk of injury to any person." HSE's employer guidance confirms those regulations "cover work on gas fittings, both natural and LPG".

If you rent your premises, check your lease and supply contract, and agree in writing who arranges each check. INDG428 says you are responsible for ensuring LPG pipework "is safe to use, even if the inspection and maintenance or replacement are carried out by a third party."

Who can work on LPG heating plant

Regulation 3(1) of the Gas Safety (Installation and Use) Regulations 1998 says: "No person shall carry out any work in relation to a gas fitting or gas storage vessel unless he is competent to do so." INDG428 states that "It is a requirement at commercial premises for gas work to be done by a 'Gas Safe' registered engineer", and that "Any work on an LPG installation and its pipework, whatever the nature, must be carried out by someone competent to do that type of work."

HSE's employer guidance says that in workplaces such as "shops, restaurants, schools and hospitals", work on gas fittings "must be carried out by a Gas Safe registered engineer who is qualified to do the work", and that "It's your responsibility to check a person is registered and is qualified." In some places, such as factories and agricultural premises, the guidance says the work must be done by a competent person, although any part used as domestic, residential or sleeping accommodation still needs a Gas Safe registered engineer. Gas Safe ID cards show the type of work an engineer is qualified to do, so check the card covers commercial work and LPG. Our guide to checking a Gas Safe engineer's commercial qualifications explains how.

The appliance matters too. Boilers are built and set up for a specific gas. Hamworthy's Upton installation guide states that "Boilers MUST NOT use gas other than that for which they are designed and adjusted", and gives a nominal LPG inlet pressure of 37 mbar against 20 mbar for natural gas. Ideal's Evomax 2 manual notes that its natural gas variants "cannot be converted to propane operation." Choosing, converting and commissioning LPG appliances is a job for the engineer, following the manufacturer's instructions.

The standards your engineer works to

IGEM/UP/2 Edition 4 (published July 2025), Installation pipework on industrial and commercial premises, covers pipework "designed to carry 2nd or 3rd family gas in the gaseous state", which includes LPG. It notes that "correctly jointed pipework will not leak throughout its lifetime. However, the local environment, mechanical damage and interference could cause leakage to occur."
Liquid Gas UK Code of Practice 22, Design, Installation and Testing of LPG Piping Systems (July 2025). IGEM/UP/2 notes that CoP 22 covers LPG service pipework "from the storage vessel up to and including the emergency control valve ECV".
Liquid Gas UK Code of Practice 1 on bulk LPG storage at fixed installations, including Part 2 (vapour off-take small bulk propane installations) and Part 3 (examination and inspection). Liquid Gas UK says some of its codes "are endorsed by the Health and Safety Executive (HSE) due to their complexity."

You don't need to own these documents, but it is reasonable to ask your contractor which standards their work and records follow. For testing of the pipework itself, see our guide to gas tightness testing on commercial premises.

Safety checks around the LPG tank

These are things site teams can look at and report on. They are not gas work, and nothing here involves touching the tank's valves, regulators or fittings.

Separation distances. HSE says there should be a minimum distance between the tank and "any building, boundary line or fixed source of ignition." New sheds, fences, walls, electrical equipment or planting should not be put closer than that distance. If you are unsure what it is, ask your supplier.
Clear, ventilated surroundings. HSE says "keep the area around the tank free of rubbish" and keep weeds and grass cut down. If weed killer is used, it should not be "chlorate-based".
Ignition sources. "No one should smoke, use electrical equipment or park vehicles near the tank." No-smoking signs should be displayed and maintained, and bonfires and barbecues kept away.
Security. Keep people with no responsibility for the LPG away from it. For tanks of four tonnes or more LPG capacity, HSE says "a security fence is required", and "Tank valve covers should be kept locked whether or not the tank is fenced."
Impact protection. Where vehicles move near the tank or its piping, HSE expects protection "such as crash barriers or bollards"; road markings and a fence alone are unlikely to be enough.
Paintwork and tanker access. HSE says the tank should not be painted any colour other than originally supplied, and the delivery parking area should be clear on delivery days.

Report any damage, corrosion, smell of gas or problems with the fencing to your LPG supplier, and tell your heating contractor if the gas supply to the boilers is affected.

Service pipework: inspection and the buried metal problem

HSE explains that the main concern with service pipework is damage, "physical impact or through chemical means, for example corrosion of a metal service pipe." Its guidance says "It is the responsibility of the owner of the pipework to ensure it is regularly inspected and maintained", and that "A competent person should review the state of the pipework and establish the length of time for which it can be used safely before its next inspection".

Buried metallic pipework is the particular risk. HSE says it "will corrode over time" even if it was protected when installed, and "will therefore need to be replaced with pipe made from non-corroding material such as polyethylene." INDG428 notes that inspection of buried pipe "will require periodic excavation", and reminds owners that "a pressure/leak test will only tell you if the pipe is leaking at the time of the test." If your supplier contacts you about replacing buried metallic pipework, HSE says you should discuss it with them and make the necessary arrangements.

HSE also gives a few things you can look at from the outside:

Is the buried route "known, recorded and, where possible, clearly marked"?
Does the pipe enter the building above ground? HSE says it "should be contained in a sleeve sealed to the structure", and the entry point should be checked in case later building work has covered it.
Does the pipework run through "any unventilated void (eg underfloor space, cellar or basement)"? HSE says it ideally should not.
Is a polyethylene riser protected by a glass-reinforced plastic sleeve?

INDG428 confirms that "A visual check of the outside of the pipework is not considered gas work". Anything beyond looking, including testing, excavation, repair or replacement, is for competent engineers.

Valves and emergency controls

HSE's valves guidance says bulk installations supplying vapour must have a regulator and, where GSIUR applies, over-pressure (OPSO) and under-pressure (UPSO) shut-off valves as back-up protection. It states the OPSO "must be re-set only by the gas supplier if it trips out". If your supply shuts off unexpectedly, contact your LPG supplier rather than trying to restore it yourself, and have your heating engineer check the plant once the supply is safe.

The emergency control valve (ECV) "is intended to allow the gas user to shut off the supply of gas in the event of an escape", and under GSIUR it must be within reach and as near as reasonably practicable to where the supply pipe enters the premises. Make sure the people who open and close the building know where it is. For rented premises, HSE says "the landlord or managing agent should ensure that the tenant(s) are aware of the location of the ECV."

If you smell gas or suspect a leak: HSE's employer guidance says to turn off the supply and immediately phone, for LPG, "your LPG supplier". The supplier's emergency number is printed on the tank. "If in doubt, evacuate the building", and "Do not turn a gas supply back on until a leak has been dealt with by a competent person." If a fire breaks out, HSE's advice is to follow your emergency plan, evacuate, and generally leave tackling any fire near the tank to the fire brigade.

DSEAR, risk assessment and written schemes

LPG is a dangerous substance for workplace law. HSE explains that the Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) "require employers to control the risks to safety from fire, explosions and substances corrosive to metals", and lists "flammable gases, such as liquid petroleum gas (LPG)" among the substances covered. Employers must find out what the risks are, put control measures in place, plan for emergencies and make sure employees are properly informed and trained. IGEM/UP/2 notes that for existing industrial and commercial installations DSEAR requires a risk assessment and "it is essential that they are maintained and inspected as determined by the risk assessment."

The LPG storage system may also fall under the Pressure Systems Safety Regulations 2000. HSE's INDG178 lists "a fixed liquefied petroleum gas (LPG) storage system, supplying fuel for heating in a workplace" among systems likely to need a written scheme of examination, while "a portable LPG cylinder" is not likely to. Because the tank is usually the supplier's, ask your supplier who holds the written scheme and when the next examination is due. Our guide to PSSR written schemes for heating plant explains how they work.

HSE also suggests that users "may wish to consider recording information about their installation, such as the route of any pipework, risk assessments they may make and any maintenance undertaken." Keep that alongside your gas safety records and service reports; see our guide to heating maintenance records.

What site and facilities teams should do (and not do)

Know your installation. Who owns the tank and the service pipework, who your supplier is, where the ECV is, and the supplier's emergency number.
Look and report. Walk round the tank compound and visible pipework as part of your routine checks, and report damage, corrosion, smells, clutter or missing signs. Our plant room safety checklist covers the rest of the walk-round.
Keep plant rooms and vents clear. HSE's employer guidance says rooms with gas appliances need adequate ventilation, so don't block air inlets or obstruct flues. See plant room ventilation for gas boilers.
Book servicing and safety checks. Have LPG boilers, heaters, flues and installation pipework serviced and checked by a Gas Safe registered engineer qualified for commercial LPG work.
Don't touch the gas equipment. Don't adjust regulators, reset an OPSO, or disconnect or alter any pipework or fittings. Liquid Gas UK's safety advice is simply: "Never tamper with the equipment."
Don't keep using faulty plant. HSE's guidance is not to use any appliance you know or suspect is unsafe. Repeated lockouts or a smell of gas should be logged and reported; our boiler lockout log sheet helps.

Need your LPG heating checked?

Call us on 0800 0996 007 or WhatsApp 07947 578332. Our Gas Safe registered commercial engineers service and repair LPG boilers, warm air and radiant heaters and water heaters, carry out gas safety checks on appliances, flues and installation pipework, and can work alongside your LPG supplier. See our commercial LPG heating, commercial gas safety inspection and commercial boiler servicing pages.

Safety note

Under the Gas Safety (Installation and Use) Regulations 1998, gas work must be carried out by a Gas Safe registered engineer, and we apply that rule on every site. Don't attempt DIY work on gas appliances, burners, flues or safety devices. On pressure systems, trained site staff should stick to visual and gauge checks, log the readings and report anything abnormal. Never adjust, cap, plug or test-lift a relief valve yourself.

Talk to a Gas Safe commercial engineer

Fast Commercial Boiler Help is a Gas Safe registered (985448) commercial heating business based at 4 Market Hill, Clare, Sudbury, Suffolk CO10 8NN. Our team of over 10 local engineers covers East Anglia and East London, working on commercial boilers, plant rooms, water heaters, and warm air, radiant and unit heaters. We work on commercial premises only.

Call 0800 0996 007

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Frequently asked questions

Who is responsible for LPG safety on a commercial site?

Responsibility is usually shared. HSE says the tank is normally owned and maintained by the LPG supplier, while the service pipework is most likely owned by whoever owns the premises, which could be the landlord. The employer or self-employed person in control must make sure gas appliances, installation pipework and flues are maintained in a safe condition under regulation 35 of the Gas Safety (Installation and Use) Regulations 1998. Agree in writing who arranges each check.

Does an LPG engineer need to be Gas Safe registered?

For commercial premises such as shops, restaurants, schools and hospitals, yes. HSE's INDG428 says it is a requirement at commercial premises for gas work to be done by a Gas Safe registered engineer, and HSE's employer guidance says the engineer must be qualified for the work. Check their Gas Safe ID card covers commercial work and LPG. In some places, such as factories and agricultural premises, HSE says the work must be done by a competent person.

How often should LPG service pipework be inspected?

There is no single interval in HSE's guidance. It says a competent person should review the state of the pipework and decide how long it can be used safely before its next inspection, taking into account when it was last checked and what was done. Buried metallic pipework needs particular attention and HSE says it will need to be replaced with non-corroding material such as polyethylene.

What should we do if we smell LPG?

HSE's employer guidance says to turn off the supply and immediately phone your LPG supplier; the supplier's emergency number is printed on the tank. If in doubt, evacuate the building. Do not turn the gas supply back on until the leak has been dealt with by a competent person. If there is a fire, follow your emergency plan and call the fire brigade.

Does an LPG tank need a written scheme of examination?

Often, yes. HSE's INDG178 lists a fixed LPG storage system supplying fuel for heating in a workplace among systems likely to need a written scheme of examination under the Pressure Systems Safety Regulations 2000, while a portable LPG cylinder is not likely to. Because the tank is usually owned by the supplier, ask them who holds the scheme and when the next examination is due.

Sources and further reading