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Frequently asked questions

Do you have a call out charge?

We always aim to repair any heating appliance/system as quickly as possible. Our technical team will diagnose the problem for a £60 fee. We will tell you the cost of the repairs and if any parts are needed. If the repair work is agreed we will add the call out fee to the final price of work.

Do you charge a call out fee to quote on a new boiler or radiator installation?

We do not charge a call out fee for quotations on new boilers and radiator installations. We will happily provide you with a FREE quote.

Do you take the old boiler/radiator(s) away within the price?

We always take your old boiler away for recycling at no extra cost.

Does a boiler need to have regular servicing?

We recommend that you have your boiler serviced each year. This will ensure that it is working at optimum performance and running safely.

Do you carry out landlord gas safety checks/certificates?

Yes. The properties you let are legally required to have all gas appliances checked every 12 months and landlords require a Gas Safety Record. When it comes to residential properties, gas safety checks and certifications are required yearly.

Do you offer discounts for multiple gas safety checks?

Yes, we do offer discounts. Please call us on: 0800 458 8929 for an accurate quote and to arrange your booking with an Assert Heating Services engineer.

Why do I not get enough hot water from my combination boiler?

Older combination boilers often have a lower flow rate than newer models. This can also occur if there is a build-up of limescale inside the boiler which can happen over time. In this situation, we suggest that you have an expert check your boiler and central heating system.

Do you have an emergency service?

Whatever the heating emergency, call Assert Heating Services as soon as you can and we’ll get a qualified engineer sent out to you, call us today on: 0800 458 8929 to arrange an emergency visit.


We offer extensive gas service solutions. From gas safety checks, gas safety certifications to gas leak repairs and other gas services in London.

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Our team of plumbing engineers work fast and efficiently and can carry out a range of services from routine leaks to advanced system problems.

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Our team of gas safe heating engineers carry out boiler repairs, install state of the art heating systems and implement system upgrades on a daily basis.

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Our rates

Boiler repairs starting from £79 – for all new and existing customers.

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Plumber in London