Vaillant Arotherm Plus 7 kW Heat Pump: Full Specifications, Suitability & Review
Table of Contents
What Is the Vaillant aroTHERM Plus 7 kW (10037213)?
The Vaillant aroTHERM Plus 7 kW (10037213) is a single-phase, air-to-water monobloc heat pump designed for domestic space heating and hot water production.
- Refrigerant: Uses natural R290 (propane) with a Global Warming Potential (GWP) of 3.
- Monobloc Architecture: The complete refrigeration circuit is sealed within the outdoor unit, eliminating indoor refrigerant pipework and requiring only standard water connections into the property.
- Efficiency: Achieves an ErP A+++ rating for 35°C low-temperature space heating applications.
As part of the wider Vaillant aroTHERM Plus heat pump range, this model sits between the 5 kW and 10 kW model.
Key Specifications at a Glance
Performance Data Table
While smaller properties often specify the aroTHERM Plus 5 kW model, the 7 kW unit provides greater thermal capacity for moderate heat-loss demands. The verified technical data from the manufacturer specifications are outlined in the table below.
| Parameter | Value |
|---|---|
| Nominal heating output (A7/W35) | 7.0 kW |
| COP (A7/W35) | ~4.8 |
| SCOP (W35, moderate climate) | ~4.6 |
| SCOP (W55, moderate climate) | ~3.8 |
| Max flow temperature | 75°C |
| Min ambient operating temp | –20°C |
| Sound pressure at 3m | ~33 dB(A) |
| Electrical supply | 230V / 1-phase / 50 Hz |
| Max current | ~13 A |
| Dimensions (H×W×D) | 1,100 × 1,100 × 450 mm (approx.) |
| Weight (operating) | ~105 kg |
| Refrigerant + charge | R290 (propane), charge ≈ 1.48 kg |
Who Should Choose the 7 kW Output Model?
The 7 kW output targets 3–4 bedroom properties with a calculated design heat loss between 5.5 and 8 kW.
- Target Housing Stock: Typical UK semi-detached and detached homes fit this capacity bracket because their thermal envelope demands exceed the output limits of a 5 kW unit at sub-zero design temperatures.
- Emitter Compatibility: Existing radiator networks can often be retained because the 75°C maximum flow temperature allows operation at a 55°C design flow without requiring wholesale radiator upsizing.
- Domestic Hot Water Integration: Dedicated heat pump cylinders pair directly because the 7 kW thermal output delivers rapid cylinder reheat times via a standard 3-port valve configuration.
- Upsizing Thresholds: Buildings exceeding 8 kW heat loss require the aroTHERM Plus 10 kW for larger properties because selecting the 7 kW model would lead to excessive direct-electric backup immersion use during peak winter conditions.
Try our heat pump size calculator for a quick estimate on the required output for your home.
R290 Propane Refrigerant: What It Means in Practice
Utilising R290 refrigerant eliminates the statutory requirement for routine F-gas leak-testing under UK environmental regulations.
- Environmental Metric: R290 carries a Global Warming Potential (GWP) of 3, compared to R32 at 675, which aligns with modern deployment of natural refrigerants in domestic heat pumps.
- F-Gas Exemption: With a factory-sealed charge mass of approximately 1.48 kg, the total carbon dioxide equivalent remains well below the statutory threshold requiring mandatory periodic leak check certification.
- Thermal Performance: Thermodynamic properties allow maximum flow temperatures up to 75°C, enabling direct retrofit integration with existing radiator circuits without compulsory emitter upsizing.
Because R290 is classified as an A3 flammable refrigerant, unit placement must adhere strictly to manufacturer-defined clearance zones away from doors, openable windows, drains, and ignition sources.
Installation & Commissioning Essentials
Electrical & Hydraulic Requirements
The 10037213 requires a dedicated 16 A circuit protected by a 30 mA Type A RCD. Adherence to these baseline engineering parameters ensures compliance with broader air-source heat pump installation requirements:
- Electrical Supply: 230V, single-phase, 50 Hz dedicated supply.
- Maximum Current: Peak operational draw reaches approximately 13 A.
- Hydraulic Connections: 1″ BSP male flow and return connections on the outdoor unit chassis.
- Minimum System Water Volume: Maintain at least 25 L of open circuit volume at all times.
- Buffer Architecture: Insufficient system volume causes compressor short-cycling, degrading seasonal performance factors and accelerating mechanical component wear.
Siting, Clearances & Noise Management
The aroTHERM Plus 7 kW generates a sound pressure level of ~33 dB(A) at 3 metres, which translates to approximately 42 dB(A) at a 1-metre boundary fence. Practical siting requires three engineering controls:
- Clearances: Maintain at least 300 mm rear clearance from external walls to ensure unhindered evaporator airflow.
- Vibration Isolation: Mount the unit on heavy-duty anti-vibration rubber feet or ground-mounted concrete slabs to prevent acoustic flanking into building fabric.
- Condensate Routing: Direct defrost run-off into an insulated soakaway or subterranean drain using trace heating to avoid winter slip hazards.
Compliance with heat pump permitted development rules in England requires verifying standard MCS 020 boundary noise calculations.
Running Costs & Boiler Upgrade Scheme Grant
The estimated annual running cost for a 7 kW unit serving a typical 3-bedroom semi-detached home with a 12,000 kWh annual heat demand at SCOP 4.6 and 24 p/kWh electricity is approximately £626.
By comparison, generating the same 12,000 kWh with mains gas at 6.5 p/kWh yields an annual fuel cost of ~£780, establishing an operational running cost differential in favour of the heat pump.
Capital outlay is offset by the £7,500 Boiler Upgrade Scheme grant across England and Wales, provided an MCS-certified contractor commissions and registers SKU 10037213 in accordance with Boiler Upgrade Scheme eligibility and application requirements. Actual running cost figures will depend on specific electricity tariffs and property fabric insulation levels.
aroTHERM Plus 7 kW vs. the Rest of the Range
The 7 kW unit occupies the mid-range position within the product family, balancing high seasonal efficiency with sufficient thermal lift for medium heat-loss envelopes.
- The aroTHERM Plus 3.5 kW serves well-insulated flats and compact two-bedroom properties.
- The 5 kW model targets standard two-to-three-bedroom homes with lower overall heat demand.
- The aroTHERM Plus 10 kW is engineered for five-plus bedroom houses or properties with higher heat loss.
Full specifications for each output are on their dedicated pages below.
Frequently Asked Questions
What system controls integrate with the aroTHERM Plus 7 kW?
The unit communicates natively with the sensoCOMFORT VRC 720 and multiMATIC systems. These weather-compensating controllers optimise flow temperatures and enable app-based scheduling via the myVAILLANT gateway.
Does this monobloc unit require glycol anti-freeze in the primary circuit?
Vaillant permits straight water if freeze-protection valves are fitted to the external pipework. Alternatively, a glycol mix prevents external freezing during power outages, though it slightly reduces thermal transfer efficiency.
Which domestic hot water cylinders are compatible with this model?
The 7 kW unit pairs directly with Vaillant uniSTOR or aroSTOR heat pump cylinders. These cylinders feature oversized internal heat exchanger coils specifically sized to maximise low-temperature heat transfer rates.
What warranty cover applies to SKU 10037213 installations?
A standard two-year manufacturer warranty applies out of the box. Registered Vaillant Advance installers can extend this warranty coverage up to seven or ten years, subject to annual servicing.
How does this model integrate into the broader Vaillant line-up?
It acts as the core workhorse within the portfolio, as detailed in our Vaillant heat pump range overview. It shares identical chassis architecture and controls with sibling units across the range.
