Skip to product information
1 of 2


Glow-worm Ultimate3 25R 25kW Heat Only Boiler with Vertical Flue Pack 10021408

Regular price £1,332.00 GBP
Regular price £1,172.16 GBP Sale price £1,332.00 GBP
Sale Sold out
Tax included. Shipping calculated at checkout.
The Ultimate3 regular (open vent) boiler is suitable for homes with high hot water demands. The Ultimate3 regular heat only boiler is available in a 25kW output and has been designed to be light and compact with cupboard fit dimensions. The boiler features flexible flue options and an aluminium heat exchanger for proven reliability and performance. Parts and labour are guaranteed for 5 years. This pack includes a vertical Flue.

  • ErP 94% A rated boiler that helps reduce energy bills
  • Exclusive to City Plumbing Supplies and Plumbing Trade Supplies
  • High efficiency modulating Grundfos pump - Lower running costs as the pump adapts to actual heating and hot water demand
  • Lightweight boiler with cupboard fit dimensions
  • Modern, bright, LCD display with easy-to-use interface
  • High grade aluminium heat exchanger for proven and reliable performance
  • Easy to install and service
  • Wide range of Glow-worm flues and accessories available
  • 5 year Guarantee


Standard 3 - 5 Business Days: £5.95

Express  1 - 2 Business Days: £9.95 

Free Standard Delivery On Orders Over: £250

We only dispatch orders between Monday to Friday.

All orders must be placed before 12pm, so they can be dispatched on the same working day.