How Often Should Commercial Gas Appliances Be Serviced?

Commercial gas servicing frequency: what the law actually says

The legal starting point is safe maintenance, not a certificate label. Regulation 35 of the Gas Safety (Installation and Use) Regulations 1998 requires employers and self-employed people, where that regulation applies, to ensure workplace gas appliances, installation pipework and flues under their control are maintained in a safe condition so that they do not cause injury. It does not prescribe one universal annual service interval for commercial premises.

HSE’s gas safety guidance for employers explains the maintenance duty and the need for competent gas work. Manufacturer instructions are the starting point for deciding what maintenance is required. Equipment condition, workload and the environment also matter. In ordinary shops, offices and restaurants, arrange gas work through a Gas Safe registered engineer qualified for the relevant commercial equipment; registration alone does not mean every engineer holds every appliance category.

Regulation 36 deals with a different duty: landlord safety checks for appliances and flues supplied for tenants’ use in defined relevant premises. Where it applies, checks are generally required every 12 months, with the permitted scheduling arrangements set out in the regulations. The definition and occupation arrangements matter. Do not apply this rule to every commercial property simply because its occupier pays rent. HSE’s landlord appliance and flue guidance explains the distinction between maintenance and safety checks. Mixed-use buildings, accommodation and shared equipment need their responsibilities checked individually.

An annual appointment can be a sensible way to organise servicing and inspection records, but it is not a substitute for identifying the actual duty. Lease terms, insurance conditions and manufacturer warranty requirements may impose additional expectations; check the actual documents rather than assuming they all specify the same interval.

How to set a practical servicing schedule

Start with an inventory: appliance make, model, location, fuel, operating hours and last service date. Locate each manufacturer’s maintenance instructions and previous reports. Ask the engineer to identify the tasks and interval for each appliance rather than applying a single date to every item. A restaurant range running throughout the day and a boiler used mainly during winter have different operating conditions.

The table below gives planning guidance, not legal deadlines. If instructions specify a shorter interval, follow that interval. If the manual is missing, obtain the correct version for the model or ask the engineer to establish an appropriate schedule. Do not lengthen a documented interval merely because the appliance appears to work normally. Keeping records makes it easier to spot recurring faults, demonstrate the maintenance arrangements and plan access without disrupting trade.

What happens during a commercial gas service?

A service should follow the appliance instructions and the agreed scope. The engineer first identifies the equipment, reviews previous faults and checks whether safe access and isolation are available. Relevant checks can include appliance condition, combustion performance, gas operating pressure, burner operation, ignition, safety controls, flue arrangements and ventilation. Cleaning and adjustment depend on the design and manufacturer procedure; not every appliance needs the same strip-down.

For catering equipment, the condition of burners, flame supervision, controls and surrounding ventilation deserves attention. Where applicable, extraction and gas interlock operation should be assessed in the agreed work. HSE’s guidance on gas safety in catering and hospitality explains the importance of suitable installation, ventilation, maintenance and competent engineers. A kitchen layout or extraction change can affect gas safety even when the cooking appliances themselves have not changed.

On a boiler, the work may include combustion analysis, burner and heat-exchanger inspection or cleaning, checks of safety controls and examination of the flue and condensate arrangements where relevant. Warm-air heater work should consider the burner, combustion system, air movement, safety controls and flue. The exact tasks must match the unit. Our commercial boiler service, catering equipment servicing and warm-air heater service pages describe the available service scopes.

At completion, retain the service report, recorded readings where provided, defects and recommendations. Confirm what has actually been serviced and what remains outstanding. A report identifying an unsafe appliance is not permission to continue using it. Repairs, replacement parts and additional testing should be agreed separately where they are outside the booked scope.

CP42, CP15 and servicing: related but different records

A gas safety inspection assesses the safety matters within its scope; a service performs the prescribed maintenance. They overlap in some checks but are not interchangeable. Request both explicitly if you need both. A certificate on file does not establish that the appliance was cleaned, adjusted or maintained in accordance with its instructions.

The CP42 commercial catering record is relevant to commercial kitchen inspections. This site’s CP15 plant commissioning page concerns commercial plant commissioning. CP42 and CP15 are industry form designations, not servicing-frequency clauses written into Regulation 35. The appropriate documentation depends on the appliance and whether the visit is an inspection, service or commissioning exercise. Ask the engineer to identify the record before booking, especially where a landlord, facilities manager or insurer has requested a specific document.

For ongoing boiler inspection requirements, see commercial boiler gas safety certification. Keep inspection records alongside service reports and remedial-work records so that a later reviewer can understand the work completed rather than relying on a certificate code alone.

Cost expectations: servicing is not certificate pricing

The starting prices below come from the corresponding published service pages. They are not a quotation for every appliance or a bundled inspection-and-service price. Model, size, access, condition, appliance count and additional work can affect the final scope and charge. Provide these details when requesting a quote and ask whether consumables, parts or remedial work are included.

Certificate pricing is separate: the published certificate price table starts at £150 + VAT for one appliance, £175 + VAT for two, £200 + VAT for three and £225 + VAT for four. Those figures must not be described as boiler-servicing prices. If requesting a combined visit, obtain a written quote covering the service tasks and the inspection documentation you need. The commercial gas safety certificate hub provides the existing booking and enquiry routes.

When to call before the scheduled service

Do not wait for an annual appointment if equipment repeatedly locks out, flames change unexpectedly, controls become unreliable, ventilation is obstructed or flue damage is apparent. Stop using equipment suspected to be unsafe and obtain appropriate professional advice. A scheduled maintenance date does not remove the obligation to respond to a developing fault. Suspected gas leaks or carbon monoxide concerns require immediate action through the appropriate emergency arrangements, not an ordinary service booking.

Before a planned visit, send the appliance list, model information, last service report and any inspection request. Arrange safe access to plant rooms, kitchens, isolation points and flues, and agree any downtime with the premises manager. Afterwards, enter the next recommended service date in the maintenance schedule and keep records of any follow-up work. This makes commercial gas servicing frequency an evidence-based maintenance decision, rather than an assumed annual legal deadline.