Heating system replacement outside London.

A full central-heating replacement is a different proposition to a boiler swap. The boiler is one component of many, and changing only the boiler on a tired system buys you a year or two before the same root problems return: sludged radiators that never warm through, undersized 8mm tails strangling flow upstairs, controls that have not seen a firmware update in a decade, and zoning that does not match how the household uses the building. A multi-day strip-out is exactly the kind of work where travelling out from London makes sense for both sides.

Our standard out-of-area replacement covers a full strip-out and re-pipe (typically 22mm primary flow and return, 15mm drops, 10mm microbore eliminated), 8 to 12 new pressed-steel radiators sized to the heat-loss calculation, a new high-efficiency boiler from Worcester, Vaillant, Viessmann, Ideal, or Baxi, externally-mounted weather-compensation sensors, and an OpenTherm load-compensating control such as Honeywell Evohome, Nest 3rd-gen, or the manufacturer's own modulating thermostat. Two to five days on site is typical for a 3 to 5 bedroom property, scheduled in a single block.

How a multi-day heating replacement runs

Eight stages, designed to keep the household functional for as much of the project as physically possible.

1. 1
   Free phone scope-out
   A 10 to 15 minute call to understand the property, the current system, the household's heating priorities, and the planned timing.
2. 2
   On-site survey and heat-loss calculation
   A day on site to measure every room, run a per-room heat-loss calculation, scope the new pipe routes, photograph everything, and confirm boiler position and flue route.
3. 3
   Written quote with day count and mileage
   A line-by-line quote: day rate per engineer, day count, mileage from the nearest M25 junction at £0.45 per mile, radiators, boiler, controls, consumables, and a fixed total.
4. 4
   Day one: strip-out
   System drained, radiators removed, old pipework lifted. Floors and decoration protected with hard board and dust sheets throughout.
5. 5
   Days two to three: first fix
   New 22mm and 15mm copper or multilayer composite pipe run, drops to each radiator, expansion vessel, filling loop, and condensate route installed.
6. 6
   Days three to four: second fix
   New boiler hung and gas-tested, radiators hung and connected on TRVs, magnetic filter on the return, weather-compensation sensor mounted, smart controller paired.
7. 7
   Commissioning, balance, and inhibitor dose
   Working-pressure test, vent and bleed, OpenTherm load-compensation paired and tested, lockshields balanced for design flow, and a BS 7593 inhibitor dose.
8. 8
   Handover, registration, and Part L notice
   Benchmark book completed, manufacturer warranty registered, smart-control walkthrough, and a Part L notification submitted under our Gas Safe competent-person scheme.