Head to head
Grant Aerona3 R32 6kW vs Heatrae Sadia Megaflo Eco 250
The Grant Aerona3 R32 6kW is a r32 inverter driven air source heat pump, 6 kw heat output. The Heatrae Sadia Megaflo Eco 250 is a indirect unvented hot water cylinder, 250 litres.
Last reviewed 13 September 2026
Specifications side by side
| Grant Aerona3 R32 6kW | Heatrae Sadia Megaflo Eco 250 | |
|---|---|---|
| Dimensions | 675 x 898 x 379.4 mm (H x W x D) | 1738 x 579 x 600 mm (H x W x D) |
| Warranty | 7 years when installed by a Grant G1 accredited installer | Lifetime guarantee in domestic installations |
| Heat output | 6 kW | - |
| SCOP | 4.61 (35C flow), 3.29 (55C flow) | - |
| Refrigerant | R32 | - |
| Weight | 51 kg | - |
| Capacity | - | 250 litres |
| Heat-up time | - | 34 minutes (15 L/min recovery, 15C to 60C) |
| Max inlet pressure | - | 1.6 MPa (16 bar) |
| Immersion heater | - | 3kW incoloy immersion, back-up |
Sources: Grant Aerona3 R32 6kW, Heatrae Sadia Megaflo Eco 250. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Aerona3 R32 6kW if...
A 6kW 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 6kW specifications →Buy or hire the Megaflo Eco 250 if...
A 250 litre indirect unvented cylinder from Heatrae Sadia's Megaflo Eco range, one of the most fitted cylinder brands in the UK. It reheats in about 34 minutes at a 15 litre/min flow rate and carries a lifetime guarantee in a domestic installation.
Full Megaflo Eco 250 specifications →Common questions
What is the difference between the Grant Aerona3 R32 6kW and the Heatrae Sadia Megaflo Eco 250?
The Grant Aerona3 R32 6kW is a r32 inverter driven air source heat pump, 6 kW heat output; the Heatrae Sadia Megaflo Eco 250 is a indirect unvented hot water cylinder, 250 litres.
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