About Grant Engineering
Grant Engineering is an Irish manufacturer with strong UK presence, historically known for oil boilers. Their Aerona range is designed for UK and Irish retrofit applications.
Aerona4 R32
The current Aerona4 R32 achieves SCOP up to 4.08. R32 refrigerant offers a better environmental profile than older refrigerants. Good UK installer support network.
Our Verdict
Solid, practical choice — especially for oil-to-heat pump conversions in rural areas. Good installer support and UK-focused design. Strong choice for replacing Grant oil boilers.
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Grant AeronaGrant heat pumpASHP review UKoil to heat pump