Boiler Installation in Goffs Oak

For a typical 1960s-70s 3-bed semi in Goffs Oak, a fully-installed A-rated combi boiler runs £2,350-£3,050 including the power flush and 22mm gas supply upgrade where required. A regular-to-combi conversion — removing the vented cylinder and cold water tank — runs £2,800-£3,600. Larger detached properties with system boilers and unvented cylinders range from £3,700-£5,500. All prices include the boiler, magnetic filter, chemical inhibitor, power flush, commissioning, Gas Safe notification and our 12-month workmanship guarantee. Fixed-price written quotes for every job.

Yes — Thames Water supplies EN7 at approximately 280-320ppm, which is in the hard water category. Without protection, limescale accumulates in the heat exchanger and causes premature failure. An Adey MagnaClean Pro2 magnetic filter is fitted as standard on every Goffs Oak installation, alongside a full system charge of chemical inhibitor. Annual servicing keeps the Vaillant 10-year warranty valid.

Many do — particularly 1960s and 1970s semis and detached homes that still have the original 15mm supply run from the meter. A modern condensing combi needs 22mm to fire at full rated output. Fitting one to a retained 15mm supply causes persistent pressure issues within weeks of installation. We check gas supply size at every survey visit and include the 15mm→22mm upgrade in the written price from the start — never flagged as an extra on the day.

If you're switching to a combi, both are removed as part of the installation. We decommission the old cylinder safely, drain and remove it, and clear the cold water tank from the loft. The airing cupboard and loft space are fully recovered as usable storage. The cylinder and tank removal is included in our regular-to-combi conversion price — it is not a separate charge.

For single-bathroom 2-3 bed semis and bungalows, a combi is the right answer. For 4-bed detached properties with two bathrooms or more, a system boiler with an unvented cylinder is worth considering — simultaneous hot water demand from two bathrooms can exceed what a high-output combi can reliably supply. We assess this at the survey visit based on your actual property.

Almost certainly yes on any system 10 or more years old. Goffs Oak's 1960s-80s circuits have been running on Thames Water's hard supply for decades without inhibitor in most cases, and the magnetite accumulation is typically significant. Fitting a new boiler to an unflushed system voids the Vaillant 10-year warranty. We include the power flush in the quoted price from the start — it is not an add-on.

A like-for-like combi swap on a post-war semi or bungalow takes one day. A regular-to-combi conversion — removing the cylinder and cold water tank — takes 2-3 days. A system boiler installation with unvented cylinder and multi-zone controls takes 3-4 days. We commit to a start date and stick to it.

For most Goffs Oak semis and 3-4 bed detached homes we recommend Vaillant ecoTEC plus — as Vaillant Advance Installers we register the 10-year manufacturer warranty at commissioning, which no standard installer can offer. For larger properties with higher output requirements, Worcester Bosch Greenstar is our second choice. For rental properties, Ideal Logic Max with its transferable 10-year warranty is the best value option for landlords.

Yes — we are accredited Vaillant Advance Installers covering all of EN7 Goffs Oak. The 10-year Vaillant manufacturer warranty is only available through accredited Advance Installers. We register it directly with Vaillant at commissioning and carry out the annual servicing to keep the warranty valid year on year.

Yes. C A Waters Plumbing & Heating is Gas Safe registered (No. 936121). All gas work in Goffs Oak is formally certificated and notified to Gas Safe. Gas Safe notification is included in the installation price — never charged separately. You can verify our registration on the Gas Safe Register website at any time.