Head to head
Glow-worm Energy Combi 25C 25kW vs Intergas Xclusive 36
The Intergas Xclusive 36 runs 8.5 litres a minute more hot water.
Last reviewed 6 October 2026
Key differences
- Hot water flow rate: the Intergas Xclusive 36 runs 8.5 litres a minute more hot water.
Specifications side by side
| Glow-worm Energy Combi 25C 25kW | Intergas Xclusive 36 | |
|---|---|---|
| Central heating output | 18 kW | 4.00 - 26.60 kW |
| Hot water flow rate | 10.4 litres per minute | 18.90 (dT 25 C) (l/min); 13.50 (dT 35 C) (l/min) |
| Hot water output | 25.7 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 94% | - |
| Dimensions | 700 x 390 x 280 mm | - |
| Weight | 32 kg | - |
| Warranty | 7 years | - |
| Power | - | 36 kW |
| Height | - | 826 mm |
Sources: Glow-worm Energy Combi 25C 25kW, Intergas Xclusive 36. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Energy Combi 25C 25kW if...
A gas combi boiler with 25.7 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.4 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 7 years. Seasonal efficiency is 94%.
Full Energy Combi 25C 25kW specifications →Buy or hire the Xclusive 36 if...
- you want one that runs 8.5 litres a minute more hot water
A wall-hung condensing combi boiler for installers fitting domestic heating and hot water without a cylinder. The Xclusive has a touchscreen panel, built-in expansion vessel and filling loop, and the larger output suits homes with higher hot water demand.
Full Xclusive 36 specifications →Common questions
What is the difference between the Glow-worm Energy Combi 25C 25kW and the Intergas Xclusive 36?
The Intergas Xclusive 36 runs 8.5 litres a minute more hot water. The Glow-worm Energy Combi 25C 25kW is a gas combi boiler, 25.7 kW hot water output; the Intergas Xclusive 36 is a 36 kW combi boiler for homes, with a 10 year parts and labour warranty.
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