Boiler & Heating Frequently Asked Questions

The cost of a new boiler depends on the boiler make and model, property size, existing heating system, installation location, flue requirements and whether any pipework or controls need changing. A straightforward replacement will usually cost less than relocating a boiler or changing the type of heating system.

A straightforward boiler replacement in the same location can often be completed within one day. More complex jobs, such as boiler relocations, system conversions or significant pipework changes, may take longer.

The right boiler depends on your property size, number of bathrooms, hot-water demand and existing heating system. Combi boilers suit many homes, while larger properties may benefit from a system or regular boiler.

Yes, in many homes a boiler can be relocated. The engineer will need to consider the gas supply, heating pipework, condensate drainage, flue position and access before confirming whether the proposed location is suitable.

Often, yes. A combi conversion can remove the need for a separate hot-water cylinder, but suitability depends on your mains water pressure, flow rate, property size and hot-water demand.

The exact package depends on the quote, but a professional installation may include removal of the old boiler, installation of the new appliance, controls, system treatment, magnetic filtration, commissioning and relevant registration.

Let’s Heat works with established boiler manufacturers including Worcester Bosch, Vaillant, Viessmann, Baxi and other leading brands. The recommended boiler should be based on the needs of your property rather than brand alone.

A boiler can stop working because of low pressure, ignition problems, controls faults, circulation issues, frozen condensate or failure of an internal component. If basic checks do not resolve the problem, professional diagnosis may be required.

Possible causes include boiler pressure problems, heating controls, a diverter-valve fault on a combi boiler, sensors or another internal fault. The exact cause should be diagnosed rather than assumed from the symptom alone.

Repeated pressure loss can be caused by a leak in the heating system, an expansion-vessel issue, pressure-relief problems or another boiler fault. Continually topping up the pressure is not a permanent solution if the cause has not been identified.

A boiler leak can come from a seal, valve, connection or another internal component. Do not remove the boiler casing or attempt internal repairs yourself. The source of the leak should be identified before deciding whether repair or replacement is appropriate.

Repeated shutdowns can be caused by pressure problems, circulation faults, overheating, ignition issues, sensors or other safety-related faults. If the boiler repeatedly locks out after being reset, arrange professional diagnosis.

A boiler fault code shows that the appliance has detected a problem and can help narrow down the area that needs investigation. It does not always prove that a particular component has failed.

Repair can make sense when the fault is straightforward, parts are available and the boiler is otherwise reliable. Replacement becomes more worth considering when an older boiler has repeated breakdowns, difficult-to-source parts or a substantial repair requirement.

For most domestic boilers, an annual service is recommended. Annual servicing is also commonly required under manufacturer guarantee terms, so check the conditions for your particular boiler.

A boiler service involves checking the appliance's condition, operation and relevant safety components in accordance with the manufacturer's requirements. The engineer may also inspect combustion, flue arrangements, seals and internal components where required.

A typical domestic gas boiler service often takes around 40–60 minutes, although this can vary depending on the boiler, its condition, accessibility and the work required.

Normally, a routine boiler service does not include replacement parts or additional repair work unless specifically stated. If a fault is discovered, the engineer should explain the problem and any additional cost before proceeding.

A service cannot guarantee that a component will never fail, but it gives the engineer an opportunity to identify deterioration, unusual operation or developing issues before they become more serious.

Yes. Gas work must be carried out by an appropriately qualified Gas Safe registered engineer. Homeowners should not remove the boiler casing or attempt repairs to internal gas, combustion or safety components.