Head to head
Glow-worm Energy Combi 30C 30kW vs Grant Aerona3 R32 10kW
The Glow-worm Energy Combi 30C 30kW is a gas combi boiler, 30.6 kw hot water output. The Grant Aerona3 R32 10kW is a r32 inverter driven air source heat pump, 10 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Glow-worm Energy Combi 30C 30kW | Grant Aerona3 R32 10kW | |
|---|---|---|
| Dimensions | 700 x 390 x 280 mm | 882 x 874 x 405 mm (H x W x D) |
| Weight | 33 kg | 70 kg |
| Warranty | 7 years | 7 years when installed by a Grant G1 accredited installer |
| Hot water output | 30.6 kW | - |
| Central heating output | 25 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 94% | - |
| Hot water flow rate | 12.5 litres per minute | - |
| Heat output | - | 10 kW |
| SCOP | - | 5.20 (35C flow), 3.47 (55C flow) |
| Refrigerant | - | R32 |
Sources: Glow-worm Energy Combi 30C 30kW, Grant Aerona3 R32 10kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Energy Combi 30C 30kW if...
A gas combi boiler with 30.6 kW of hot water output, sized for a three-bed house with one or two bathrooms. It delivers about 12.5 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 30C 30kW specifications →Buy or hire the Aerona3 R32 10kW if...
A 10kW R32 inverter driven heat pump from Grant's Aerona3 range, a common choice for off-gas-grid homes that previously ran an oil boiler. It carries a 7 year warranty through Grant's G1 installer scheme, one of the longer standard terms in this category.
Full Aerona3 R32 10kW specifications →Common questions
What is the difference between the Glow-worm Energy Combi 30C 30kW and the Grant Aerona3 R32 10kW?
The Glow-worm Energy Combi 30C 30kW is a gas combi boiler, 30.6 kW hot water output; the Grant Aerona3 R32 10kW is a r32 inverter driven air source heat pump, 10 kW heat output.
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