Our website uses cookies to help provide you with the best experience tailored to your interests. To use the website with full comfort, please accept to receive all cookies on our website. For more information with regard to Cookies please see our Privacy policy.

Accept Decline

Ultimate₃ regular boiler

Exclusive regular boiler with 5 years warranty*

  • ErP A rated for efficiency - to reduce energy bills
  • £15 reward when registered through Club Energy
  • Lightweight boiler with cupboard fit dimensions
  • FREE 5 year warranty with option to extend*

The Ultimate₃ is Glow-worm’s high performance, ErP A rated boiler range developed for the one off installer market, and exclusively manufactured for City Plumbing Supplies.

The Ultimate₃ regular (open vent) boiler is designed for homes with a high hot water demand and is available as a 25kW model. The Ultimate₃ regular model is lightweight for easy installation, and is so flexible it can be sited inside a kitchen cupboard thanks to its compact dimensions.

Designed using an automotive grade, aluminium heat exchanger, the Ultimate₃ offers proven reliability and performance whilst being light to install and also easy to maintain. The model also offers flexible flue options for easy siting, and a modern, bright, LCD display with a simple-to-use interface.

The complete Ultimate₃ range (including combi, system and regular options) is compatible with the full range of Glow-worm controls including the popular MiGo app based control.

The Ultimate₃ offers installers a £15 reward and comes with a free 5 year warranty when registered through Club Energy; where installers can also benefit from business tools including the Plumbing Toolbox app, Gas Safe Notifications, Benchmark and some great rewards.

*When registered through Club Energy

Features & benefits

  • Regular 25 kW output with small, compact, cupboard-fit dimensions
  • Modern, bright, LCD display with easy-to-use interface
  • High quality, automotive grade, aluminium heat exchanger providing excellent performance
  • High efficiency, A rated boiler for ErP energy labelling to reduce energy bills
  • Uses familiar Glow-worm diagnostics for easy install & servicing
  • Compatible with full range of Glow-worm controls, flues and accessories
  • Ideal for use with Glow-worms innovative MiGo app based control
  • 5 years parts and labour guarantee with option to extend*
  • Telescopic flue option available
  • ø60/100 and ø80/125 flue options available
  • Wide range of Glow-worm accessories available including spacing frame and pipe cover plate
  • Plume Management kit compatible

*When registered through Club Energy

Specifications

Specifications

Ultimate₃ system boiler25kW
Casing dimensions (H x W x D mm)740 x 418 x 300
Weight (lift) (kg)32
Performance
CH output minimum/maximum (kW)6.1/25.5
SEDBUK rating 200989.3
NOx class (natural gas)5
LPG compatibleNo
ErP ratingA
Construction
Heat exchanger materialAluminium
Burner typePre-mixed
Fully modulatingYes
DHW plate heat exchangerYes
Integrated hydroblocYes
Installation
Suitable for sealed systemsYes
Inbuilt filling loopIntegrated
Inbuilt condensate trap/siphonYes
Inbuilt boiler frost protection2 Stage
Zero compartment ventilationYes
PumpGrundfos
Clearances
Top (from top of boiler mm)300
Side (mm)0*
Bottom (mm)300
Front (mm)600**
User interface
User displaySuper Bright LCD
DiagnosticsAdvanced
User adjustable CH temperature controlYes
Pipes
Water connections (mm)2 x 22/2 x 15
Flues
Maximum horizontal Ø60/100 (m)9
Maximum vertical Ø60/100 (m)9
Maximum horizontal Ø80/125 (m)25
Maximum vertical Ø80/125 (m)25
Optional flume management kit Ø60/100Yes
Optional spacing frameYes

*See manual for clearance if side panels are to be removed to assist future service and maintenance

** 5mm if removable panel/door

Related Products

Related Products

Climapro₂ RF Control

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 room thermostat

  • 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)

Downloads

Downloads

Alternative products

Alternative products

Ultimate₃ combi boiler

Exclusive combi boiler with 5 years warranty*

  • Leading combi boiler offering great performance
  • FREE 5 year warranty* with option to extend
  • £15 reward when registered through Club Energy
  • Available in 30kW and 35kW models

Ultimate₃ system boiler

Exclusive system boiler with 5 years warranty*

  • ErP A rated for efficiency - helping to reduce energy bills
  • FREE 5 year warranty with option to extend*
  • £15 reward when registered through Club Energy
  • Available as 25kW model