Emergency07879 388645Get a price

Journal

Choosing a new boiler

Brands, boiler types, guarantees and what a proper installation includes.

5 min readBy Ross, Gas Safe engineerUpdated October 2026
New combi boiler installed in a utility cupboard by HOLMHEAT

Ross checks the property, hot-water demand, water pressure and existing pipework before recommending anything, then quotes plainly for the boiler, controls and associated work.

Up to 10 yrGuarantee on eligible Vaillant & Glow-worm
myREWARDSVaillant & Glow-worm installer
963857Gas Safe registered

The boilers Ross fits

Vaillant

Ross's first choice. As a myREWARDS installer he can register eligible Vaillant boilers for up to a 10-year guarantee when fitted with a Vaillant filter.

Glow-worm

Made by the Vaillant group. Dependable value, with up to a 10-year guarantee on eligible models fitted with a Glow-worm filter.

Lower-cost makes

If keeping the cost down matters most, Ross fits dependable budget makes, usually with a 5-year guarantee, to exactly the same standard.

Worcester Bosch

Fitted on request if it is the make you want. The manufacturer's guarantee is confirmed in your quote.

Which boiler type?

Combi

Heating and hot water on demand from one unit. Suits most homes with good mains pressure.

System

Works with a hot-water cylinder, often unvented, for strong hot water to several outlets at once.

Regular (heat-only)

For traditional systems with tanks in the loft, or where a like-for-like swap makes sense.

Electric

Where gas is not available or not wanted. Ross installs and services electric boilers; the supply cable to the consumer unit is run by a qualified electrician.

What a good installation includes

  • Survey and boiler sizing check before quoting
  • Clean, neatly routed pipework
  • System flush or clean and inhibitor to protect the new boiler
  • Magnetic filter to capture debris
  • Controls fitted and explained: a Hive or tado° smart thermostat, or an ESI programmable room thermostat
  • Carbon monoxide alarm fitted
  • Commissioned, tested and registered for guarantee
Worcester Bosch boiler installation
Vaillant combi boiler installation

Installation day, step by step

  1. 01

    Survey & quote

    Most quotes from photos, some after a quick visit. Either way, a clear written quote.

  2. 02

    Install, usually in one day

    Old boiler out, system cleaned, new boiler and controls fitted neatly. Conversions too.

  3. 03

    Commission

    Combustion checked with an analyser, controls programmed, everything tested.

  4. 04

    Handover

    Walk-through, paperwork and guarantee registration.

Up to 10-year guarantee

Eligible Vaillant and Glow-worm boilers fitted with the manufacturer's filter can have up to a 10-year guarantee. Ross registers it for you, and the boiler needs servicing every year to keep it valid. Exact cover is confirmed in your quote.

Get a price Emergency