Head to head
Viessmann Vitocal 150-A13 vs Worcester Bosch Greenstar 5800i AW 7kW
The Viessmann Vitocal 150-A13 is a r290 air source heat pump, 8.1 kw heat output. The Worcester Bosch Greenstar 5800i AW 7kW is a r290 monobloc air source heat pump, 7.97 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Viessmann Vitocal 150-A13 | Worcester Bosch Greenstar 5800i AW 7kW | |
|---|---|---|
| Heat output | 8.1 kW at A7/W35 | 7.97 kW at 7/35C |
| Refrigerant | R290 (propane), GWP 0.02 | R290 (propane) |
| Dimensions | 920 x 450 x 360 mm (H x W x D) (indoor unit); 841 x 1144 x 600 mm (H x W x D, single fan) (outdoor unit) | 800 x 1100 x 540 mm (H x W x D) |
| Weight | 162 kg (single fan) (outdoor unit) | 143 kg |
| Max flow temperature | 70C down to -10C outdoor | 75C |
| COP | 4.7-5.0 at A7/W35 | - |
| Sound power | 51 dB(A) assessed total at A7/W55 | - |
| SCOP | - | 4.54 (MCS, 35C flow) |
| Sound pressure | - | 42 dB(A) |
Sources: Viessmann Vitocal 150-A13, Worcester Bosch Greenstar 5800i AW 7kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Vitocal 150-A13 if...
A Vitocal 150-A monobloc-style split heat pump using the natural refrigerant R290, rated at 8.1kW and reaching a 70C flow for boiler-replacement work. Viessmann-trained installers can extend the standard warranty on registration.
Full Vitocal 150-A13 specifications →Buy or hire the Greenstar 5800i AW 7kW if...
The larger 5800i AW unit, for a slightly bigger house than the 5kW model while sharing the same cabinet size and 42 dB(A) sound rating. Its R290 refrigerant and 75C flow temperature suit a radiator-based retrofit.
Full Greenstar 5800i AW 7kW specifications →Common questions
What is the difference between the Viessmann Vitocal 150-A13 and the Worcester Bosch Greenstar 5800i AW 7kW?
The Viessmann Vitocal 150-A13 is a r290 air source heat pump, 8.1 kW heat output; the Worcester Bosch Greenstar 5800i AW 7kW is a r290 monobloc air source heat pump, 7.97 kW heat output.
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