Planned boiler servicing is the item on a maintenance schedule that nobody notices until it has been missed. WTS Plumbing & Heating work from Unit 2, Jayes Park Courtyard at Ockley, south of Dorking on the A29, so the town is one of the closest commercial patches to our head office. Our Gas Safe registered engineers service commercial heating plant across RH4 and RH5 on a planned regime, with dated records, flue gas readings and a clear list of what was adjusted, what was replaced and what needs watching before the next visit.
This page is about maintaining plant you already have, not replacing it. Dorking's commercial stock runs from glazed office buildings on Station Road to the industrial and warehouse units at the Glebelands Centre on Vincent Lane, period shop frontages on West Street and South Street, and public buildings such as the council offices at Pippbrook. Each of those gives a different service visit: different access, different shutdown windows, and different evidence needed by an insurer or an auditor. A Station Road office regime is built around a summer shutdown and a light heating load, while the Glebelands Centre has to be booked twice over, because landlord plant and tenant plant sit on separate orders and separate budgets.
Typical commercial buildings in Dorking
The purpose-built office stock sits north west of the centre at Dorking Office Park on Station Road, a set of detached, glazed office buildings in landscaped grounds with atrium receptions and generous on-site parking. Buildings specified that way carry heating plant, hot water generation and booster sets that all need a dated service history, and they tend to run a light summer load that gives us a sensible window for the annual visit. A second office cluster sits at Pixham End, where the former Aviva building is the subject of a redevelopment, and Milton Court, west of the town centre, is a restored historic house in corporate use, where plant is often tucked into converted rooms rather than a purpose-built plant room.
North west of the town centre, Curtis Road is an established light industrial and business area holding trade units, garages, self storage and The Atrium Business Centre at number four, serviced offices around a full height atrium with workshop units behind. Vincent Lane holds the Glebelands Centre, the last industrial site before Westcott Road, with the older works buildings including Interpet House and Book House alongside later warehouse units, the estate having been extended from 1985 onwards. Servicing across an estate like that means landlord plant and tenant plant on the same visit, with different people paying for each.
The rest of the work is public, retail and leisure. Mole Valley District Council works from Pippbrook on Reigate Road, and Dorking Halls at the top of the High Street is part way through a refurbishment that replaces air handling units and chillers and adds solar and heat recovery. Dorking Community Hospital is on Horsham Road, New House Surgery on South Street, and Dorking Sports Centre on Reigate Road runs a 25 metre pool, a teaching pool and a six court hall. Denbies Wine Estate on London Road opens 362 days a year and has a 17 bedroom hotel and restaurant on the same site.
What this covers in Dorking
Service regimes matched to the building
We write a regime for each plant item and set the frequency by duty, not by the calendar. A boiler serving one office floor on Station Road may need one full service and one interim check a year. A plant room carrying a pool and a sports hall needs more, and so does a kitchen open most days of the year. A visitor estate with a hotel and restaurant that trades almost every day of the year needs a regime built backwards from its handful of closure days rather than around a service month that suits the contractor.
Combustion analysis and flue gas readings
Every service ends with an analyser on the flue. We record CO, CO2 and the CO to CO2 ratio, flue gas temperature and efficiency, before and after any adjustment, so a drift in burner performance shows up as a trend across visits rather than as a breakdown. Readings go on the record with the analyser calibration date. On room sealed appliances venting through an existing chimney in the older town centre stock, flue integrity gets the same attention as the burner.
Gas soundness, ventilation and interlocks
On a commercial service the meter, the pipework and the ventilation get checked alongside the appliance. We check the meter and emergency control valve, carry out a tightness test on the installation pipework, check gas rating against the data plate, and check plant room ventilation is clear and correctly sized for the appliances actually in the room. Where a catering kitchen shares the supply, as it does behind a restaurant or in a venue kitchen, the gas interlock and its ventilation proving are tested on the same visit.
Water quality and system cleanliness
Older Dorking stock, the period shops on West Street, the pubs and the converted works buildings off Vincent Lane, tends to have distribution pipework far older than the boiler bolted onto it. We sample and test system water at service, check inhibitor concentration, pH and dissolved iron, look at strainers, dirt separators and air vents, and log the result. A falling inhibitor level or rising iron is the early warning that a high efficiency heat exchanger is about to block.
Records an insurer or auditor will accept
You get a service record per appliance, not one sheet per building: appliance make, model, serial and location, the checks carried out, the readings taken, parts changed, the engineer who signed it and the date. Where a gas safety record is the right document we issue that too. For managed estates on Curtis Road or at the Glebelands Centre we can hold the whole portfolio on one schedule so nothing quietly falls off the list between tenancies.
Warranty protection and uptime
Most commercial boiler warranties depend on a documented annual service by a competent engineer, worked to the manufacturer schedule and using genuine parts. That condition bites hardest where heat cannot be lost. In the care home stock at Dorking Manor on Ridgeway Road or at Stanecroft, a claim refused because the schedule was not followed means hiring in heat for a building full of residents while the boiler is argued over. School plant at The Ashcombe and The Priory has the opposite problem, because a wear part left to fail cannot be changed until the next holiday, so seals, electrodes, ignition leads, fans and pressure switches get changed on condition at the planned summer visit instead.
Who carries the duty, and what they have to show
In commercial premises the duty falls on the employer or self-employed person in control of the place of work where the plant sits, which on a let unit is often the tenant rather than the landlord. Who controls what is normally set by the lease, so read it before assuming. The Gas Safety (Installation and Use) Regulations 1998 require gas appliances and pipework in premises you control to be kept in a safe condition, and work on them to be done by a Gas Safe registered business with the right competencies for commercial plant. On a Curtis Road or Glebelands Centre letting that usually splits three ways: a managing agent holds the keys and books the access, the landlord owns the boiler serving common areas and the shell, and the occupier controls the appliance inside its own demise. Get the order signed by whoever actually controls that appliance rather than by whoever is easiest to invoice, because the record needs to name a duty holder who was entitled to instruct the work. When a unit changes hands part way through a regime, the appliance records, the last combustion readings and any outstanding remedial list should travel with the demise, or the incoming tenant starts a compliance history from nothing. We write our records to be read by someone who was not there.
Getting to the plant, and getting the shutdown
Servicing in Dorking is a shutdown problem before it is a mechanical one. Retail, hospitality and leisure buildings will not give up heat or hot water during trading hours, so the visit goes overnight or onto a closure day agreed weeks ahead. Dorking Community Hospital on Horsham Road and New House Surgery on South Street need a permit raised in advance and the isolation window fitted around clinic times, which is a conversation with the estates or practice manager long before an engineer is on site. School plant is holiday work with a hard handback date, so anything we open has to be back in service and proved before the building reopens, which means parts are ordered ahead of the visit rather than after the strip down. Office buildings on Station Road are the easiest of the lot, though low headroom in a basement car park rules out a tall van and means a longer carry to the riser. Where a plant room carries more than one boiler we sequence the modules so the building keeps heat while each one is off.
Typical commercial buildings in Dorking
- Grade A offices and business parks
- Light industrial and trade units
- Serviced offices and managed workspace
- Town centre retail and period shop premises
- Care homes and supported living settings
- Schools and sixth form buildings
- NHS and primary care premises
- Hotels, pubs and visitor attractions
- Leisure centres and sports facilities
Duties and standards that apply
- Work on commercial gas appliances and pipework must be carried out by a Gas Safe registered business, and the individual engineer must hold the appropriate commercial competencies for the appliance type and size. WTS Plumbing & Heating are Gas Safe registered and work on commercial heating plant. Domestic qualifications do not cover commercial plant, so ask to see the engineer card and the appliance categories listed on it before any service visit, whoever carries it out.
- The Gas Safety (Installation and Use) Regulations 1998 place a duty on employers and self-employed people to ensure gas appliances, pipework and flues at any place of work under their control are maintained in a safe condition. The prescribed annual check and record set out in those regulations is aimed at residential lettings, so there is no single statutory certificate covering most commercial premises. In practice, the service record and any gas safety record you hold are what an insurer, an auditor or an enforcing officer will ask to see.
- The Pressure Systems Safety Regulations 2000 place duties on users and owners of certain pressure systems, including having a written scheme of examination for the parts covered. Whether a particular heating installation falls within scope depends on the system, its contents and its stored energy, so it should be assessed rather than assumed. A written scheme is a separate exercise from a boiler service and is normally carried out by an inspection body appointed through your insurer.
- Water treatment sits outside gas legislation but is usually a manufacturer warranty condition and is covered by published industry guidance, including BSRIA guidance on water treatment for closed heating and cooling systems. That guidance is not law, but a warranty claim can be refused where the manufacturer required a treatment regime and no sampling record exists. Keeping test results with the service history is the practical answer.
Common questions
At least annually, and more often where the plant runs hard or serves a building that cannot lose heat. Most commercial manufacturers set annual servicing as a warranty condition, and several specify a shorter interval for high duty use or for appliances sitting in dirty environments such as a workshop unit off Curtis Road. On continuously loaded plant we usually put in one full service plus one or two interim checks, and on an office building that runs light through the summer a single full service is often enough.
Not in the way a residential landlord does, but you still carry a duty and you still need evidence. The annual check and record set out in the Gas Safety (Installation and Use) Regulations 1998 is aimed at residential lettings. For commercial premises the duty is to keep the installation safe and maintained, and your service records, tightness test results and combustion readings are what show you have. We issue a gas safety record where the premises, the lease or your insurer calls for one.
Usually yes, if the building has more than one boiler or a sensible sequence. Modular plant lets us isolate and service one module at a time while the rest carries the load, which is how we work in care homes and on visitor sites that trade almost every day of the year. Where a single appliance carries the whole building, we plan around the quietest window: overnight for hospitality and town centre retail, holidays for schools, and around clinic times for the surgery and hospital stock.
Split it by what each party controls, then put it all on one schedule so nothing is missed. On estates such as the Glebelands Centre on Vincent Lane or the units around Curtis Road, plant serving common areas and plant inside a tenant demise often sit with different budget holders and different contractors. We can service both under one programme and give you a per-appliance record set, which is far easier to hand to an insurer than a folder of unmatched certificates.
The appliance is classified, made safe and reported to you the same day. A Gas Safe registered engineer will classify a defect as Immediately Dangerous or At Risk under the industry unsafe situations procedure, seek your permission to disconnect or cap where that applies, and leave a warning notice on the appliance. What the service visit leaves you with is the classification in writing with the reason for it, the warning notice, the appliance labelled and capped where it has been taken out of use, and a separate written quote for the remedial work so it can be ordered on its own. If the building then needs temporary heat while that work is arranged, our Dorking commercial boiler repairs page covers how we handle it.
Talk to us about Dorking
If you look after commercial premises in Dorking and your boiler servicing has drifted into being a callout arrangement, we can put it back on a schedule. Send us the plant list, the appliance data plates or last year's records and we will come and look at the plant rooms, then quote a written regime with visit dates, scope and the records you will get. Our head office at Ockley is a short run down the A29, so a Dorking site is one of the easiest for us to reach. Call 01306 621 057.
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