aroTHERM pro

Air-to-Water Heat Pump

Our most compact heat pump has been designed to fit in any space
Minimal protective zone allows maximal freedom of positioning
With flow temperatures up to 70 °C suitable for renovations, retrofits and new builds
Uses the sustainable and future-proof refrigerant R290
Durable quality and reliable operation for years to come

Heat pumps

cooling

heating

hot water

Overview

The ultimate space-saver

Minimum size for maximum comfort: the aroTHERM pro with an output of 5 to 11 kW is our space-saving heat pump. It is not only the ideal solution for new buildings. Due to its high flow temperatures of up to 70 °C, it is the ideal solution for modernising your heating system while keeping existing radiators. Thanks to our industry-unique safety concept to reduce protective zones, the heat pump can be placed almost anywhere. With ErP labels up to A+++ (D - A+++), it offers highly efficient heating and is also eligible for subsidies. Furthermore, its use of the natural refrigerant R290 makes it a future-proof choice.

Our most compact heat pump.

The aroTHERM pro line is our most space-saving heat pump solution. Even the largest output size of 11 kW is still so compact that it can fit under a window. This makes it one of the most compact heat pumps on the market. The aroTHERM pro is smaller than the aroTHERM plus and has only one fan. This is definitely an advantage when trying to find the required 0.5 square metres of space for the outdoor unit.

Maximal flexibility. Minimal safety area.

The new standard in heat pump technology: Our new safety concept allows maximum freedom for outdoor installation. Until now, air-to-water heat pumps with R290 had larger protective zones and therefore a limited choice of location. That's a thing of the past: thanks to our new Flexible Space Function, you can also install the aroTHERM pro directly next to doors, windows and cellar shafts or sockets and outdoor lighting.

Suitable for every application

With flow temperatures of up to 70 °C in heat pump mode without a backup heater, the aroTHERM pro is the ideal solution for all applications. It is suitable for both existing buildings with radiators and new builds with underfloor heating. In existing buildings, it can maintain high flow temperatures reliably, even in sub-zero temperatures of -25 °C, efficiently keeping the house warm. It is particularly efficient in new builds with lower heat requirements, achieving an impressive COP of 5.0 at A7/W35 with the 5 kW model. This ensures low running costs and reduced environmental impact.

Best performance. Better for the environment.

Quality that keeps its promises

Vaillant products stand for carefully selected features and materials, rigorous testing beyond standard conditions, over 150 years of experience in heating technology, and outstanding service that lasts. Our heat pumps have undergone extensive testing in extreme environments - from freezing temperatures of -25°C to scorching heat of +48°C, and humidity levels reaching 100%. Their robust design includes salt‑resistant construction and triple‑protected metal panels. Manufactured within our European factory network - including our site in Remscheid, Germany - every product reflects this commitment to quality, durability, and trusted local expertise. And because true quality means long-term support, we guarantee spare part availability for 15 years after production ends, ensuring peace of mind for years to come.

Specifications

	VWL 55/7.1 A 230V S3	VWL 85/7.1 A 230V S3	VWL 125/7.1 A 230V S3	VWL 125/7.1 A S3	VWL 155/7.1 A S3	VWL 155/7.1 A 230V S3	VWL 55/7.1 A 230V	VWL 75/7.1 A 230V	VWL 115/7.1 A	VWL 155/8.1 A Q
ErP
ErP Seasonal Space Heating Efficiency Low Temp Class	A+++ \| D -> A	A+++ \| D -> A	A+++ \| D -> A	A+++ \| D -> A	A+++ \| D -> A	A+++ \| D -> A	A+++ \| D -> A	A+++ \| D -> A	A+++ \| D -> A	A+++ \| D -> A
ErP Seasonal Space Heating Efficiency High Temp Class	A++ \| D -> A	A++ \| D -> A	A++ \| D -> A	A++ \| D -> A	A++ \| D -> A	A++ \| D -> A	A++ \| D -> A	A++ \| D -> A	A++ \| D -> A	A++ \| D -> A
Power Output and Efficiency
Heat Output / Power Consumption / COP for A-7/W35 (acc. to EN 14511)	4,84 kW / 1,70 kW / 2,91	6,37 kW / 2,39 kW / 2,66	9,83 kW / 3,78 kW / 2,60	10,07 kW / 3,88 kW / 2,60	9,92 kW / 3,88 kW / 2,56	10,51 kW / 4,27 kW / 2,46	4,84 kW / 1,70 kW / 2,91	6,37 kW / 2,39 kW / 2,66	11,12 kW / 4,36 kW / 2,55	11,12 kW / 4,36 kW / 2,55
Heat Output / Power Consumption / COP for A2/W35 (acc. to EN 14511)	2,36 kW / 0,56 kW / 4,21	3,50 kW / 0,84 kW / 4,15	6,38 kW / 1,52 kW / 4,21	6,78 kW / 1,66 kW / 4,10	6,50 kW / 1,56 kW / 4,17	6,37 kW / 1,51 kW / 4,23	2,36 kW / 0,56 kW / 4,21	3,50 kW / 0,84 kW / 4,15	6,50 kW / 1,56 kW / 4,17	6,50 kW / 1,56 kW / 4,17
Heat Output / Power Consumption / COP for A7/W35 at ΔT=5 K (acc. to EN 14511)							3,36 kW / 0,68 kW / 4,93	4,48 kW / 0,92 kW / 4,83	7,53 kW / 1,49 kW / 5,03	7,53 kW / 1,49 kW / 5,03
Heat Output / Power Consumption / COP for A7/W45 at ΔT=5 K (acc. to EN 14511)							4,26 kW / 1,12 kW / 3,80	6,98 kW / 2,00 kW / 3,50	6,97 kW / 1,92 kW / 3,63	6,97 kW / 1,92 kW / 3,63
Heat Output / Power Consumption / COP for A-7/W55 (acc. to EN 14511)							4,78 kW / 2,23 kW / 2,14	6,11 kW / 2,93 kW / 2,08	9,43 kW / 4,54 kW / 2,07	9,43 kW / 4,54 kW / 2,07
Heat Output / Power Consumption / COP for A7/W55 at ΔT=8 K (acc. to EN 14511)							6,35 kW / 2,12 kW / 2,99	6,67 kW / 2,27 kW / 2,92	8,49 kW / 2,73 kW / 3,10	8,49 kW / 2,73 kW / 3,10
Cooling Output / Power Consumption / EER for A35/W18 at ΔT=5 K (acc. to EN 14511)	5,61 kW / 1,32 kW / 4,35			10,32 kW / 3,96 kW / 2,60	12,94 kW / 4 kW / 3,23	12,94 kW / 4,01 kW / 3,23	5,61 kW / 1,32 kW / 4,35	7,15 kW / 1,65 kW / 4,32	12,95 kW / 3,24 kW / 4,00	12,95 kW / 3,24 kW / 4,00
SCOP (Low Temperature)	5,01	4,87	4,89	4,89	4,93	5,09	5,01	4,87	4,93	4,93
SCOP (High Temperature)	3,7	3,62	3,67	3,67	3,66	3,84	3,7	3,62	3,66	3,66
SEER	5,85	7,04	6,53	6,53	5,44	6,53	5,85	7,14	6,53	6,53
Electrical Connection
Electrical Power Consumption (max)	3,2 kW	3,5 kW	5,7 kW	5,7 kW	5,7 kW	5,7 kW	3,2 kW	3,5 kW	5,7 kW	5,7 kW
Electrical Power Consumption (Standby Mode)	8,8 W	8,8 W	8,8 W	8,8 W	8,8 W	8,8 W	8,8 W	8,8 W	8,8 W	8,8 W
Electrical Power Consumption (Standby Mode / with Flexible Space Funktion)	13,9 W	13,8 W	20,8 W	20,8 W	20,8 W	20,8 W	13,9 W	13,8 W	20,8 W	20,8 W
Electrical Voltage Supply	230 V (50 Hz)	230 V (50 Hz)	230 V (50 Hz)	400 V (50 Hz)	400 V (50 Hz)	230 V (50 Hz)	230 V (50 Hz)	230 V (50 Hz)	400 V (50 Hz)	400 V (50 Hz)
Fuse Type	Characteristic B, single-pole switching	Characteristic B, single-pole switching	Characteristic B, single-pole switching	Characteristic B, single-pole switching	Characteristic B, single-pole switching	Characteristic B, single-pole switching	Characteristic B, single-pole switching	Characteristic B, single-pole switching	Characteristic C (slow blow), triple-pole switching	Characteristic C (slow blow), triple-pole switching
IP Rating	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4
Protection Class	I	I	I	I	I	I	I	I	I	I
Refrigerant
Refrigerant	R290	R290	R290	R290	R290	R290	R290	R290	R290	R290
Refrigerant Quantity	0,5 kg	0,6 kg	1,05 kg	1,05 kg	1,05 kg	1,05 kg	0,5 kg	0,6 kg	1,05 kg	1,05 kg
GWP	0,02	0,02	0,02	0,02	0,02	0,02	0,02	0,02	0,02	0,02
CO₂ Equivalent	0,00001 t	0,00001 t	0,00002 t	0,00002 t	0,00002 t	0,00002 t	0,00001 t	0,00001 t	0,00002 t	0,00002 t
Operation Fluids
Content Heating Circuit	1,66 l	1,78 l	4,31 l	4,31 l	4,31 l	4,31 l	1,66 l	1,78 l	4,31 l	4,31 l
Hydraulics
Flow Rate / Remaining Pump Head at ΔT=5 K , Heating Flow (for W35)	860 l/h / 588 mbar	1.275 l/h / 675 mbar	1.775 l/h / 630 mbar	1.775 l/h / 630 mbar	2.445 l/h / 352 mbar	2.445 l/h / 352 mbar	860 l/h / 588 mbar	1.275 l/h / 675 mbar	2.445 l/h / 352 mbar	2.445 l/h / 352 mbar
Flow Rate / Remaining Pump Head at ΔT=8 K , Heating Flow (for W55)	700 l/h / 610 mbar	900 l/h / 770 mbar	1.300 l/h / 750 mbar	1.300 l/h / 750 mbar	1.700 l/h / 660 mbar	1.700 l/h / 660 mbar	700 l/h / 610 mbar	900 l/h / 770 mbar	1.700 l/h / 660 mbar	1.700 l/h / 660 mbar
Pump Volume Flow (min)							521 l/h	522 l/h	1.225 l/h	1.225 l/h
Pump Volume Flow / Remaining Pump Head (max)							860 l/h / 588 mbar	1.275 l/h / 675 mbar	2.445 l/h / 352 mbar	2.445 l/h / 352 mbar
Connections
Connection Dimension Heating (Flow, Return)	G 1 ¼″	G 1 ¼″	G 1 ¼″	G 1 ¼″	G 1 ¼″	G 1 ¼″	G 1 ¼″	G 1 ¼″	G 1 ¼″	G 1 ¼″
Noise Emission
Sound Power Level at A-7/W35 (60 % Noise reduction mode / outdoor)							48,2 dB(A)	49,9 dB(A)	55,1 dB(A)	55,1 dB(A)
Sound Power Level (outdoor) (max)							57,7 dB(A)	60,9 dB(A)	65,6 dB(A)	65,6 dB(A)
Sound Power Level at A7/W55 (ErP / outdoor)							49 dB(A)	49 dB(A)	54,8 dB(A)	54,8 dB(A)
Dimensions
Height / Width / Depth (without packaging)			1.103 mm / 1.169 mm / 454 mm	1.103 mm / 1.169 mm / 454 mm			750 mm / 1.104 mm / 454 mm	750 mm / 1.104 mm / 454 mm	1.103 mm / 1.169 mm / 454 mm	1.103 mm / 1.169 mm / 454 mm
Weight (without packaging)			132,2 kg	136,6 kg			84 kg	90,3 kg	136,6 kg	136,6 kg
Weight Ready for Operation	84,5 kg	90,9 kg	133,25 kg	137,65 kg	137,65 kg	133,25 kg	84,5 kg	90,9 kg	137,65 kg	137,65 kg
Limitations
Distance (Outdoor to Last Indoor Unit) (max)	20 m	20 m	20 m	20 m	20 m	20 m	20 m	20 m	20 m	20 m
Operating Pressure Heating Circuit (max)	2,5 bar	2,5 bar	2,5 bar	2,5 bar	2,5 bar	2,5 bar	2,5 bar	2,5 bar	2,5 bar	2,5 bar
Fan Speed (max)	575 rpm	630 rpm	550 rpm	550 rpm	550 rpm	550 rpm
Flow Temperature (Heating Mode) (min - max)							10 - 70 °C	10 - 70 °C	10 - 70 °C	10 - 70 °C

aroTHERM pro

Air-to-Water Heat Pump

Overview

The ultimate space-saver

Our most compact heat pump.

Maximal flexibility. Minimal safety area.

Suitable for every application

Best performance. Better for the environment.

Quality that keeps its promises

Specifications

Specifications

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