Boiler Replacement in Bromley

Signs your boiler needs replacing rather than repairing

A boiler over 15 years old with repeat breakdowns, rising repair costs, or parts that are no longer manufactured is almost always more economical to replace than repair. An efficiency below an A-rating (ErP) means you are paying significantly more in gas bills than necessary. If the repair estimate exceeds 30 percent of the replacement cost, replacement is the right decision.

Combi vs system vs regular boiler: which type suits your property

A combi boiler heats water on demand with no hot water cylinder — the correct choice for most London one and two-bedroom flats. A system boiler heats water stored in a cylinder and suits larger properties with two or more bathrooms where simultaneous hot water demand is high. A regular (heat-only) boiler is only encountered in older properties with a back boiler or a gravity-fed system — virtually all replacements convert to combi or system.

Sizing: kW output by property

A 24kW combi is appropriate for a one to two-bedroom flat or house with one bathroom. A 28kW combi suits a two to three-bedroom property with one bathroom. A 32 to 35kW combi is correct for a three to four-bedroom property with a family bathroom and en-suite. Oversizing is as problematic as undersizing: an oversized boiler short-cycles, reducing efficiency and component life.

What is included in a replacement: the full scope

A full boiler replacement should include: the new boiler and flue, updated controls, a magnetic filter on the return pipe to catch sludge and magnetite, a chemical system flush before the new boiler is connected, commissioning to manufacturer specification, and Gas Safe self-certification notification to the local authority. Do not accept a quote that omits the system flush or magnetic filter.

Brand comparison: Worcester Bosch, Viessmann, Vaillant, Ideal

Worcester Bosch Greenstar carries a 10 to 12 year warranty when installed by an accredited installer. Viessmann Vitodens is the premium option with genuine modulating combustion and a 10 year warranty. Vaillant ecoTEC offers 10 year warranty and strong UK engineer support. Ideal Logic carries a 7 year warranty at a lower supply price — a solid choice for landlord properties on a managed replacement cycle. All four brands carry ErP A-ratings.

Landlord boiler replacement obligations and finance options

If a Gas Safe engineer condemns a boiler as Immediately Dangerous, a landlord is legally required to replace it before the property can be re-let. Most landlord boiler replacements are funded directly or through a finance agreement. Note that the Boiler Upgrade Scheme (BUS) government grant applies to heat pump installations only — it does not apply to gas boiler replacements. Finance for boiler replacement is available from most major installers at 0 to 9.9 percent APR depending on creditworthiness.