Central Heating and Hot Water Repairs in London

Whether it is no heating, no hot water, cold radiators or a fault code on the boiler, a GasSafe engineer finds the actual cause across the whole system before undetaking the repair.

4.9 stars, 1,000+ reviews | GasSafe registered | Same or next day | One-hour arrival window | Book online 24/7

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Why Silver Saints

Here is why London customers have booked Silver Saints for central heating and hot water repairs since 2008.

• 4.9 stars from over 1,000 Google reviews
• 5 stars on Trustpilot and Checkatrade
• GasSafe registered engineers for all gas and heating work
• £5 million public liability insurance
• Operating since May 2008
• Faults diagnosed across the whole system before any repair is quoted
• A specific one-hour arrival window on every booking

Need a central heating or hot water repair in London? We can often come today or tomorrow.

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How much does a central heating repair cost in London?

Central heating and hot water repairs from Silver Saints in London are charged at £98 plus VAT per hour for gas, boiler and heating work, with no call-out fee and Saturday at the same weekday rate. Most common heating repairs, such as a failed pump, a stuck valve or bleeding and balancing radiators, are completed within the hour, and the engineer explains the parts and the likely cost before starting the repair. Larger heating work is quoted after a survey visit at £35 plus VAT, which is deducted from the cost of the work if you go ahead. A fixed-price annual boiler service is £100 plus VAT, and a fixed-price unvented cylinder service is also £100 plus VAT.

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What central heating faults do you repair?

Silver Saints repairs the full range of central heating and hot water faults across London, not just the boiler. That includes no heating or no hot water, cold radiators, radiators cold at the bottom from sludge or cold at the top from trapped air, heating leaks, low system pressure, noisy pipes or a kettling boiler, faulty pumps and motorised valves, and heating controls that are not doing what they should. Because the same symptom can have several causes across the boiler, cylinder, valves and controls, the engineer diagnoses the whole system rather than assuming the boiler is at fault, then explains what needs doing before any repair is quoted.

Boiler faults and repairs

The boiler is the heart of the system, and Silver Saints repairs boiler faults across all major London brands including Worcester Bosch, Vaillant, Ideal, Baxi and Glow-worm. Common boiler faults include the boiler not firing or locking out, low pressure, intermittent shutdowns, ignition and pilot faults, error codes, and a frozen condensate pipe causing a winter lockout. For a dedicated boiler fault, see our gas boiler repairs page, and if the boiler is old and repeatedly failing, we will advise honestly when a boiler replacement is the better value option rather than paying for repeated repairs.

Radiators, valves and cold spots

Cold radiators are one of the most common central heating complaints in London homes, and the cause points to the fix. A radiator cold at the top usually needs bleeding to release trapped air, while a radiator cold at the bottom points to sludge and poor circulation, and radiators that will not heat at all often point to a stuck valve or a balancing problem. Silver Saints bleeds and balances radiators, and carries out radiator and radiator valve repairs including seized valves and faulty thermostatic radiator valves, so heat is restored evenly across the property.

Thermostats, timers and heating controls

When the heating comes on at the wrong time, will not reach temperature, or does not respond at all, the fault is often in the controls rather than the boiler. Silver Saints diagnoses and repairs heating controls across London, including room thermostats, programmers and timers, thermostatic radiator valves, and motorised and zone valves that have stuck or failed. Getting the controls working correctly often restores comfort and cuts wasted gas without any need to touch the boiler itself.

When a power flush is the real fix

If radiators are repeatedly cold at the bottom, the water running from a bled radiator is black, or the whole system is slow to warm through, the underlying problem is usually sludge rather than any single component. In that case, repeated small repairs do not solve it, and a central heating power flush to clean the system is the real fix. Silver Saints will tell you honestly when a flush is the right answer and when it is not, rather than selling one as a default.

Hot water problems

No hot water, or hot water that runs out too quickly, can come from the boiler, the cylinder or the controls, so Silver Saints diagnoses the whole hot water side rather than guessing. On a combi boiler the fault is usually within the boiler or its diverter valve, while on a stored system it often points to the cylinder, the immersion or a motorised valve. For pressurised and Megaflo systems, see our unvented hot water cylinder service and repairs, carried out by G3-qualified engineers.

For landlords and letting agents

Silver Saints keeps rental heating systems running for landlords and letting agents across London, and a heating repair sits naturally alongside a landlord gas safety certificate and an annual boiler service in the same visit. We arrange access directly with your tenant or collect keys from your agent, and you can read more about our landlord services, including the pre-approved spend limit that lets routine repairs go ahead without quote-chasing.

Central heating repair FAQs

Can you repair my central heating in London today?

Silver Saints offers same-day and next-day central heating and hot water repair appointments across London, subject to GasSafe engineer availability. Call 0207 0999 199 or book online at bookings.silversaints.com and the team will confirm the earliest slot for your postcode.

How much does a central heating repair cost in London?

Central heating and hot water repairs are charged at £98 plus VAT per hour, with no call-out fee and Saturday at the same weekday rate. Most common repairs are completed within the hour, and parts and the likely cost are agreed with you before the work starts.

Why do I have no heating but hot water still works, or the other way round?

Heating working without hot water, or hot water without heating, usually points to a motorised or zone valve, a controls fault, or a pump problem rather than the boiler itself. A Silver Saints GasSafe engineer diagnoses which part of the London system is at fault before quoting the repair.

Why are my radiators cold when the boiler is on?

Radiators cold at the top usually need bleeding to release trapped air, while radiators cold at the bottom point to sludge and poor circulation. Silver Saints bleeds and balances radiators and repairs radiator valves, and where sludge is the underlying cause will advise whether a power flush is the real fix.

Do you repair the boiler as well as the heating system?

Yes. Silver Saints repairs boilers as part of central heating work, across all major London brands, and also services and replaces boilers. For a dedicated boiler fault, our gas boiler repairs page covers it, and we will advise if a replacement is better value than continued repairs.

Can you fix my heating thermostat or timer?

Yes. Silver Saints diagnoses and repairs heating controls across London, including room thermostats, programmers and timers, thermostatic radiator valves, and motorised and zone valves. Faulty controls are a common cause of heating problems that do not need any work on the boiler.

Is my heating engineer GasSafe registered?

Yes. All gas, boiler and heating work at Silver Saints is carried out by GasSafe-registered engineers, who operate under their own GasSafe registration, which is the legal requirement for gas work in London homes.

Can you repair the heating and issue a gas safety certificate in one visit?

Yes. Because Silver Saints engineers are GasSafe registered, a central heating repair can be combined in the same London visit with an annual boiler service or a landlord gas safety certificate, saving a second appointment and a second tenant access slot.

In summary

Silver Saints central heating and hot water repairs is a GasSafe service covering the whole heating system in London homes: boilers, radiators, valves, pumps, thermostats, timers and hot water. The engineer diagnoses the actual cause across the system before quoting, then repairs it, whether that is no heating, no hot water, cold radiators, a boiler fault, a controls problem or sludge needing a power flush. Work is carried out Monday to Saturday, 8am to 5pm, at £98 plus VAT per hour, with a fixed-price boiler service and unvented cylinder service at £100 plus VAT each. Silver Saints is rated 4.9 stars on Google from over 1,000 reviews, is fully insured, and has worked on London heating since 2008. To book, call 0207 0999 199