02 Oct

An industrial boiler is often the one piece of plant that the rest of the site depends on. If it fails, heating, hot water, process steam or production can stop with it. A proper service is your best protection against that. Yet many site managers have never been told what a service should include, so they have no way of judging whether they got one.This post sets out what we check on an industrial boiler service, how steam plant differs, and what affects the cost. We don't publish a price list, because two boilers that look alike can need very different amounts of work.

What an industrial boiler service should include

Every service should follow the boiler and burner manufacturer's instructions. On a typical gas-fired industrial boiler, a service covers:

A visual check of the installation: the plant room, the gas supply, the flue connections, ventilation openings and the general condition of the boiler.
Burner inspection and cleaning: the burner head, the ignition electrodes and the flame detection, with worn parts identified.
Gas pressure and heat input: checking that the burner is firing at the rate it was set up for.
Combustion analysis: measuring oxygen or carbon dioxide, carbon monoxide and flue gas temperature at the firing rates the burner uses. Poor readings show up wasted fuel and developing faults.
Safety and control devices: flame failure response, limit and control thermostats, air pressure switches and, where fitted, valve proving systems. These are tested to confirm they actually shut the burner down.
The flue and chimney: condition, connections and terminations.
A written record: the readings, the defects found, the work done and the work still needed, usually on a CP15 servicing record for each appliance.

If an engineer leaves without giving you a written record of the combustion readings, you have no evidence that the boiler was set up correctly, and nothing to compare with next year.

How steam boilers differ

Steam boilers carry extra risks and extra controls. Alongside the gas and burner work, a service on steam plant pays close attention to the water level controls and alarms, the pressure controls and the burner's response when they operate.Steam boilers also come under the Pressure Systems Safety Regulations 2000. The boiler must have a written scheme of examination, and a competent person, often an inspector arranged through your insurer, carries out periodic examinations. That is separate from the gas service. A good gas engineer will work with your inspection dates and leave the burner and gas train in a fit state for the examination.

What affects the cost

Without seeing the site we can't quote a figure, but these are the factors that drive the price:

The number and size of boilers. A single boiler in a plant room is a different job from several large boilers working together.
Burner type. Simple on/off burners take less time than modulating burners with more complex combustion controls.
Hot water or steam. Steam plant has more safety controls to test.
Access and timing. Plant rooms on roofs or in confined spaces, permits to work, and visits that have to happen at night or during a shutdown all add time.
Age and condition. Older plant may need more cleaning and adjustment, and parts can be harder to get.
Remedial work. Any parts or repairs found during the service are quoted separately, so you can decide what happens next.
Contract or one-off. Servicing under a planned maintenance contract can be scheduled with other visits to the site, which is usually more efficient than booking each appliance separately.

The cheapest service is not always the lowest cost. A rushed visit that misses a failing flame sensor can cost far more in lost production than the difference in price.

How to prepare for the visit

You can help the engineer get more done in the time on site:

Have the previous service records and any warning notices ready.
Tell us about faults, lockouts or unusual noises since the last visit.
Arrange access, permits and isolation times in advance.
Confirm when the boiler can be taken out of service, and for how long.

Frequently asked questions

How often should an industrial boiler be serviced?

At least once a year for most gas-fired boilers, or more often if the manufacturer recommends it or the boiler runs for long hours. Your insurer may also set conditions.

Will my boiler need to be switched off?

Yes, for part of the visit. We agree timings in advance so the shutdown fits your operation, including out-of-hours visits where needed.

Do you service steam boilers as well as hot water boilers?

Yes. We service industrial boilers and steam plant, working with your pressure systems inspection dates.

Can you service boilers from different manufacturers?

Yes. We work on boilers and burners from a wide range of manufacturers. Tell us the makes and models when you get in touch.

Book an industrial boiler service

Send us the make, model and number of boilers on site, and we will get back to you with a quote.SMR Gas Maintenance Ltd

Unit 10 Higher Walton Mill, Cann Bridge Street, Higher Walton, Preston PR5 4DJ

📞 07882 898492 (24/7 commercial emergency call-out)

📧 andy@smrgasservices.co.uk

🌐 www.smrgas.co.uk

Gas Safe Register No. 562186. Industrial and commercial work only.

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Industrial Boiler Servicing in Preston: What's Included and What Affects the Cost