Boiler installation outside London.

A boiler installation outside London is the kind of project we will travel for. A like-for-like combi swap is a single day on site; a system boiler with a new unvented cylinder, a full re-balance, and smart-control commissioning typically runs to two days for a pair of engineers. The time-on-site is long enough that the journey from our north-west London depot is reasonable for both sides, and the work itself is too consequential to leave to whoever the local British Gas franchisee dispatches that week.

We install Worcester Greenstar, Vaillant ecoTEC, Ideal Logic Max, Viessmann Vitodens 100-W and 200-W, and Baxi DuoTec. Every installation is dosed with BS 7593 inhibitor (Sentinel X100 or Fernox F1), commissioned with a flue-gas analysis logged on the Benchmark commissioning record, registered with the manufacturer for the full warranty (10 years on Worcester, 12 years on Vaillant and Viessmann with matched system filter), notified to Building Control under our Gas Safe competent-person scheme for Part L, and signed off with a full handover pack.

How an out-of-area install runs

Eight clearly-numbered stages, every one of them in writing before the second one starts.

1. 1
   Free phone scope-out
   A 10 to 15 minute call to confirm the property type, the existing boiler model, the flue route, the gas-meter location, and the chosen replacement brand. We confirm it is the right job for us before any quote is drafted.
2. 2
   Written quote with mileage breakdown
   Day rate, mileage from the nearest M25 junction at the HMRC AMAP £0.45 per mile, materials at trade cost plus 30%, and a fixed total. Signed off by you in writing before the diary block is reserved.
3. 3
   Materials staged in London
   Boiler, flue kit, filter, inhibitor, and consumables collected from our trade supplier, loaded the night before. No on-site dependency on a local merchant's stock.
4. 4
   Arrival on the agreed date
   Van loaded, dust sheets and pipe-cutting station set up inside the boiler cupboard. System isolated at gas, water, and electric. Existing boiler drained and removed.
5. 5
   System flush and filter fit
   Full chemical clean with Sentinel X400, fresh water rinse, and an Adey MagnaClean Pro2 or Fernox TF1 Sigma fitted on the return line. Required for the manufacturer warranty.
6. 6
   New boiler fitted and gas-tested
   Boiler hung, gas, flow, return, condensate, and flue connected. Tightness test on the gas line, working-pressure test on the heating side, condensate trap primed.
7. 7
   Commissioning and inhibitor dose
   First-fire sequence, flue-gas analysis, ratio checks, balancing across the radiator network, and a BS 7593 inhibitor dose introduced via the filter port.
8. 8
   Handover, registration, and Building Control notice
   Benchmark book completed, Gas Safety record issued, manufacturer warranty registered, smart-control walkthrough, and a Part L notification submitted under our competent-person scheme.