Ultimate₃ Regular (Open Vent) Boiler
High efficiency regular boiler from Glow-worm
- High performance, ErP A rated regular boiler
 - Lightweight boiler with cupboard fit dimensions
 - Up to 10 years guarantee available*
 
High performance
The Ultimate₃ 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.
*FREE 5 year standard guarantee available. 10 year extended guarantee is only available for boilers registered through myREWARDS with a Glow-worm Power System filter.
Specifications
Specifications
| Ultimate₃, Regular Boiler | 25kW | 
|---|---|
| Boiler dimensions (H x W x D mm) | 600 x 375 x 280 | 
| Maximum horizontal flue length 60/100 (m) | 10 | 
| Maximum vertical flue length 60/100 (m) | 10 | 
| PCDB seasonal efficiency (%) | 89.6 | 
| ErP rating | A | 
Related Products
Related Products
MiGo Link internet gateway
- Remote access with the MiGo Link app
 - Enables weather compensation with compatible controls
 - Works with MiSet, MiGo Select and Climastat Select controls
 
MiSet
- Touch interface allows fuss-free heating at your fingertips
 - Time programming assistant helps you set your timer in a few simple steps
 - Boiler modulation ensures peak performance and optimum efficiency for your Glow-worm heating system
 
MiGo Select smart control
- Wireless, smart and simple room thermostat
 - Clear digital display
 - Boiler modulation
 
Climastat Select
- Easy to use
 - Clear digital display
 - Simple & discreet 2 wire connection
 
Downloads
Downloads
How to get
Want to find out more?
Find your local Glow-worm Installer
By choosing a local Glow-worm installer, you’re choosing our network of fully trained, independent installers who can offer you exclusive extended guarantees, as well as a no obligation quote to ensure your Glow-worm boiler is the perfect fit for you and your home.
Alternative products
Alternative products
Ultimate₃ Combi Boilers
- Leading combi boiler offering outstanding performance
 - ErP A rated for efficiency – helping you to reduce your energy bills
 - Our 30kW and 35kW models suit homes of all sizes
 
Ultimate₃ System Boiler
- Highly reliable system boiler offering outstanding performance
 - ErP A rated for efficiency – helping you to save money on your energy bills
 - Available in a 25kW model
 
Energy regular boiler
- ErP A rated for efficiency
 - Compact size – perfect in kitchen cupboards
 - Ultra quiet operation
 
