Head to head
Vaillant aroTHERM plus 5kW vs Viessmann Vitocal 150-A13
The Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kw heat output. The Viessmann Vitocal 150-A13 is a r290 air source heat pump, 8.1 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Vaillant aroTHERM plus 5kW | Viessmann Vitocal 150-A13 | |
|---|---|---|
| Heat output | 5 kW | 8.1 kW at A7/W35 |
| Refrigerant | R290 (propane), low GWP | R290 (propane), GWP 0.02 |
| Sound power | 53 dB(A) at A7/W35, 58 dB(A) at A7/W55 | 51 dB(A) assessed total at A7/W55 |
| Dimensions | 965 x 1100 x 450 mm (H x W x D) | 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) |
| Weight | 128 kg (operating) | 162 kg (single fan) (outdoor unit) |
| Max flow temperature | 75C | 70C down to -10C outdoor |
| SCOP | up to 5.03 | - |
| COP | - | 4.7-5.0 at A7/W35 |
Sources: Vaillant aroTHERM plus 5kW, Viessmann Vitocal 150-A13. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the aroTHERM plus 5kW if...
The smallest aroTHERM plus, sized for a well-insulated flat or small house. It uses the natural refrigerant R290 rather than an F-gas, and reaches a 75C flow temperature, which helps it work with existing radiators on a retrofit job.
Full aroTHERM plus 5kW specifications →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 →Common questions
What is the difference between the Vaillant aroTHERM plus 5kW and the Viessmann Vitocal 150-A13?
The Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kW heat output; the Viessmann Vitocal 150-A13 is a r290 air source heat pump, 8.1 kW heat output.
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