The Pressure Systems Safety Regulations 2000 (PSSR) apply to some commercial boilers and not others, and where they do apply, the legal duty to keep the system safe sits with the person who operates it, not with the engineer who services it. That distinction catches out a good number of duty holders across the North East, usually because a routine service has been taken to mean statutory compliance. It has not.
This article sets out when PSSR applies to a commercial boiler, who is responsible, what a written scheme of examination involves, and how the regulations sit alongside gas safety law. It is general guidance. Your own plant will need to be assessed against the Health and Safety Executive's current documents, in particular the Approved Code of Practice L122, Safety of pressure systems.
PSSR does not apply to a boiler because it is commercial. It applies according to what the system contains, the pressure it works at, and how it is built. The regulations cover a "pressure system", which includes a pressure vessel, its associated pipework and its protective devices, where the system contains a "relevant fluid". Under the regulations that means steam at any pressure, and certain gases or fluids whose pressure would exceed 0.5 bar above atmospheric pressure if released. Confirm the exact wording and any exclusions against L122 and the regulations themselves, as HSE guidance can be revised.
The practical consequence is that steam boilers are the clearest case. If your site raises steam, whatever the pressure, you should assume PSSR is in scope until a competent person tells you otherwise.
Conventional low-temperature hot water (LTHW) heating circuits running at modest pressure generally fall outside the regulations, because the water is not steam and does not meet the pressure threshold when released. Pressurised hot water and high-temperature systems are different. The water may be held well above its normal boiling point, and it can flash to steam if released, so these need individual assessment rather than a rule of thumb.
Each of these is likely to need a scope decision on the record. A boiler house manager who simply assumes the answer, in either direction, has not discharged the duty. If you are unsure, ask a competent person, such as an engineer-surveyor from an inspection body, to confirm scope in writing.
PSSR draws a line between "users" and "owners". The user is the person who has control of the operation of an installed system. The owner duties apply mainly to mobile systems. For a fixed boiler in a plant room, the duty therefore generally falls on the user, which in practice is usually the employer or the occupier running the site. Check the precise duty-holder wording in the regulations and L122 for your circumstances.
The key point is that the duty is statutory. It is not transferred by appointing a contractor, and it does not vanish because the building is leased.
Lease terms cannot remove a statutory duty, although they can be used to agree who carries out which tasks. Where a landlord owns the plant and a tenant operates it, or where several tenants share a central boiler house, the allocation should be agreed in writing. Name the duty holder, say who commissions examinations, who pays for them, and who acts on the findings. Ambiguity here tends to show up only after something has gone wrong.
PSSR is made under the Health and Safety at Work etc. Act 1974, and enforcement sits with HSE or the local authority, depending on the type of premises. Penalties are a matter for the courts and the circumstances of each case, so they are not covered here.
Facility managers acting for owners should confirm, plant room by plant room, who the duty holder is. Do not assume the answer carries across a portfolio. A site that changed hands, was sublet or had its management contract re-tendered may now have a different answer from the one in the old file.
A written scheme of examination (WSE) is the document at the centre of PSSR for most users. It is drawn up, or certified as suitable, by a competent person, and it specifies which parts of the system must be examined and at what intervals. Without one, where the regulations require it, the system cannot lawfully be operated.
The WSE must include the system's protective devices, such as safety valves, which are the last line of defence against over-pressure. It also covers the pressure vessel and, where relevant, parts of the pipework. The scheme is specific to your plant: it identifies the items by description and sets out what the examination should involve.
The competent person is usually an engineer-surveyor working for an insurer or an inspection body. They need the knowledge, experience and independence to judge the system's condition and to set a suitable scheme. This is a separate role from the engineer who services your boiler, and the two should not be confused.
Routine maintenance keeps the boiler running efficiently and safely. A statutory examination under a WSE is an independent assessment of the pressure-bearing parts and protective devices against the scheme. A clean service report does not satisfy the scheme, and an examination report does not replace servicing.
There is no single interval that fits every system. The competent person sets the frequency according to the risk, the type of equipment, its age, its duty and its history. Be wary of anyone who quotes a universal figure without having seen your plant. Your WSE states what applies to you.
Keep the WSE, every examination report and the repair and modification history for each system, and make sure they can be produced on request. When a competent person reviews the scheme, they will need that history, and so will any inspector who visits.
An in-date examination does not end your duties. The user must operate the system within its safe operating limits, which are the pressure and temperature limits set for the system by its design, and must give operators adequate written instructions. The system must also be properly maintained so that it stays safe between examinations.
When an examination report makes recommendations, the duty holder must act on them. Where the competent person sets a timescale, that timescale is the deadline. If they identify a condition that makes the system dangerous, it should not be run until it has been dealt with.
Anything involving the gas side of the boiler, such as burners, gas valves or flues, is for a Gas Safe registered engineer only. Operators should not adjust or attempt to repair these components.
In the North East, the first cold snaps in October and November often bring plant back to heavy load after months of light use, and that is when worn components and neglected controls tend to show themselves. Schedule checks, overdue repairs and any outstanding examination actions before demand peaks, rather than in the first cold week.
PSSR is concerned with pressure integrity: that the vessel, pipework and protective devices will contain what they are meant to contain. The Gas Safety (Installation and Use) Regulations 1998 address a different risk, the safe installation, maintenance and use of gas appliances, pipework and flues. A gas-fired steam boiler may have to satisfy both sets of rules at once, and meeting one does not meet the other.
All gas work, including burner, gas valve and flue work, must be done by a Gas Safe registered engineer. You can check any engineer or business on the Gas Safe Register before they start. Nobody should attempt do-it-yourself work on a boiler, its gas supply or its flue.
If you suspect a gas leak, leave the area immediately and call the National Gas Emergency Service on 0800 111 999. Do not operate switches or try to find the source yourself.
Commercial Boiler Solutions carries out Gas Safe registered maintenance, annual inspections and repairs across the North East and Northumberland. Where your inspection body has set an examination date, we can coordinate our engineer visits with that schedule, so that servicing and repairs are completed beforehand and any findings can be dealt with promptly. Our services and maintenance contract options are set out on our website.
Most PSSR problems come from gaps in ownership and paperwork rather than from neglect of the plant itself. These are the ones that recur.
Keep one register for the whole estate. For each pressure system, list the site and plant room, the named duty holder, the competent person, the WSE date, the last examination, the next examination due, and any open actions. Review it at least annually, and whenever a site changes hands or plant is altered. It takes little time to maintain and it answers most of the questions an inspector will ask.
PSSR compliance comes down to three things: knowing whether each of your systems is in scope, naming the duty holder in writing, and keeping the written scheme of examination current and acted upon. Everything else, from records to operator training, follows from those. Because HSE guidance can be updated, check the current position as of 2026 against L122 or with your competent person.
If you manage commercial boiler plant in Newcastle, Sunderland, Middlesbrough, Tyneside, Wearside, Teesside, Northumberland or North Yorkshire, Commercial Boiler Solutions can help with the Gas Safe registered side: maintenance, annual inspections, repairs and a regional maintenance contract that fits around your examination schedule. Learn more about our services.