Head to head
Grant Aerona3 R32 13kW vs NIBE S2125 Model 8
The Grant Aerona3 R32 13kW is a r32 inverter driven air source heat pump, 13 kw heat output. The NIBE S2125 Model 8 is a air/water heat pump, up to 5.4 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Grant Aerona3 R32 13kW | NIBE S2125 Model 8 | |
|---|---|---|
| Heat output | 13 kW | 5.33 kW (average climate), 5.4 kW (cold climate) |
| SCOP | 5.40 (35C flow), 3.72 (55C flow) | 5.0 at 35C, 3.7 at 55C (average climate); 4.1 at 35C, 3.2 at 55C (cold climate) |
| Dimensions | 1418 x 1024 x 403 mm (H x W x D) | 1070 x 1130 x 820 mm (H x W x D) |
| Weight | 99 kg | 150 kg |
| Refrigerant | R32 | - |
| Warranty | 7 years when installed by a Grant G1 accredited installer | - |
| Sound power | - | 49 dB(A) at nominal rating (EN12102) |
| Max flow temperature | - | up to 75C |
Sources: Grant Aerona3 R32 13kW, NIBE S2125 Model 8. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Aerona3 R32 13kW if...
A 13kW 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 13kW specifications →Buy or hire the S2125 Model 8 if...
A smaller NIBE S2125 rated to keep working in cold climates, reaching up to 65C flow even at -25C outdoors. It suits a smaller house where cold-weather reliability matters more than raw output.
Full S2125 Model 8 specifications →Common questions
What is the difference between the Grant Aerona3 R32 13kW and the NIBE S2125 Model 8?
The Grant Aerona3 R32 13kW is a r32 inverter driven air source heat pump, 13 kW heat output; the NIBE S2125 Model 8 is a air/water heat pump, up to 5.4 kW heat output.
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