Ultimate2 Regular (open vent) Boiler

High efficiency regular boiler from Glow-worm

  • High performance, ERP A rated regular boiler
  • £15 reward when registered through Club Energy
  • Lightweight boiler with cupboard fit dimensions
  • FREE 5 year warranty* with option to extend*

The Ultimate2 regular boiler provides outstanding heating performance in a 25kW model, and is best suited to homes with high hot water demands, where a hot water storage cylinder and a cold water tank are already installed.

Being both lightweight and very compact, the Ultimate2 regular boiler can easily be installed within a kitchen cupboard if required.

The boiler features a modern, bright LCD display with an easy to use interface, and is also compatible with Glow-worm’s popular Migo app based control (sold separately) – meaning you can control your heating and hot water from anywhere/anytime simply using your mobile phone or tablet.

The Ultimate2 also comes ready with a 5 year parts and labour guarantee, when your Gas Safe registered installer registers the installation, on the Glow-worm Club Energy installer loyalty programme.

*When registered through Club Energy

Key Features & Benefits

• Superior performance regular (open vent) boiler available in a 25kW model

• Modern bright LCD display with easy to use interface

• Kitchen cupboard fit dimensions

• High quality automotive grade aluminium heat exchanger providing excellent performance

• High efficiency, A rated boiler for ErP energy labelling to reduce energy bills

• Compatible with full range of Glow-worm controls, flues and accessories

• Ideal for use with innovative MiGo app based control - when used in conjunction with appropriate system pack

• 5 years parts and labour guarantee with option to extend*

• Wide range of flue options available

• Wide range of Glow-worm accessories available should your property require them



Ultimate2, Reglar Boiler25kW
Casing dimensions (h w d)600mm x 375mm x 280mm
60/100 Flue length
2009 annual efficiency (%)
ErP RatingA

Related Products

Related Products

Climapro₂ RF

  • Two channel wireless programmable room thermostat
  • Backlit display provides advanced user control and functionality
  • Capable of room and weather compensation*
  • Simple to use handheld unit

Introducing MiGo

The personal heating assistant

  • Wi-Fi thermostat and easy-to-use app
  • Manage heating and hot water from anywhere
  • Reduces energy consumption, saves money
  • Internet weather compensation
  • eBUS communication

Climastat The Energy System Boiler

Thermostat from Glow-worm

  • Easy to use
  • Extra low voltage
  • Simple & discreet 2 wire connection
  • Polarity not important

Climapro1 Control

Available wireless and wired

  • Annual service reminder function
  • Automatic update for summer and winter
  • Simple and discreet
  • Weather compensation ability (when used with optional outdoor sensor)



Alternative products

Alternative products

Ultimate2 Combi Boiler

High efficiency combi boiler from Glow-worm

  • Leading combi boiler offering outstanding performance
  • A rated for efficiency – helping you to reduce your fuel bills
  • FREE 5 year parts and labour warranty*
  • Extended warranty options available
  • Available in 30kW and 35kW models to suit homes of all sizes

Ultimate2 System Boiler

High efficiency sealed system boiler from Glow-worm

  • Highly reliable system boiler offering outstanding performance
  • A rated for efficiency – helping you to save money on your fuel bills
  • FREE 5 year parts and labour warranty*
  • Extended warranty options available*
  • Available in a 25kW model