Ultimate₃ System Boiler
High efficiency sealed system boiler from Glow-worm
- 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
 - Up to 10 years guarantee available*
 
The Ultimate₃ System boiler provides outstanding heating performance in a 25kW model, and is suitable for homes with high hot water demands (when combined with a hot water storage cylinder).
*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 system boiler | 25kW | 
|---|---|
| Boiler dimensions (H x W x D mm) | 740 x 418 x 300 | 
| Maximum horizontal flue length 60/100 (m) | 10 | 
| Maximum vertical flue length 60/100(m) | 10 | 
| PCDB seasonal efficiency (%) | 89.7 | 
| ErP rating | A | 
Related Products
Related Products
MiGo personal heating assistant (discontinued)
- Remote heating and hot water control
 - Automatically learns your energy needs
 - MiGo and Glow-worm boilers speak the same language
 
Climapro₂ RF control
- Simple-to-use handheld unit can be wall mounted or portable within the living area
 - Backlit display provides advanced user control and functionality
 - Two channel wireless programmable room thermostat
 
Climastat (discontinued)
- Easy to use
 - Extra low voltage
 - 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 Regular (Open Vent) Boiler
- High performance, ErP A rated regular boiler
 - Lightweight boiler with cupboard fit dimensions
 - Up to 10 years guarantee available*
 
Energy system boilers
- Compact size will fit perfectly in kitchen cupboards
 - ErP A rated for efficiency
 - Up to 10 years guarantee available**
 
