The Stiebel Eltron WPL-A 07 HK 230 Premium is a monobloc air source heat pump for outdoor installation from Stiebel Eltron's Premium platform, using the low-GWP R454C refrigerant rather than the R290 used across the HPA-O range. It delivers 6.87 kW at A-7/W35, a Seasonal COP of 4.88 at 35 °C, and flow temperatures up to 75 °C — suitable for retrofit properties running on radiators as well as new-build underfloor systems. This is the same heat pump used across Stiebel Eltron's WPL-A Premium kit range (Pack 1–3 and the Premium Compact Set).
6.87 kW
Heating Output (A-7/W35)
48 dB(A)
Sound Power Level
230V single-phase
Electrical Supply
Pricing on request
This configuration is supplied at price on request. Stiebel Eltron systems are matched to the property, so we confirm the full specification and cost with you directly before quoting. Please use the request a quote link on this page or contact our technical team with the property details below.
Electrical and unvented cylinder compliance
Electrical connection must be carried out by a competent electrician to Part P and BS 7671, and grid-connected units require a DNO notification (G98/G99) prior to commissioning. Cylinder installation must meet G3 Building Regulations for unvented hot water storage.
Key features
Inverter technology
Variable-speed inverter compressor delivers high efficiency and low energy bills across the operating range.
Low noise, with silent mode
Intelligent appliance design keeps noise emissions low, with a night-time "silent mode" available for further reduction.
Heating and active cooling
Provides cooling in summer months in addition to heating and DHW support.
High flow temperature for retrofit
Flow temperatures up to 75°C give first-rate hot water convenience and support existing radiator circuits in older buildings.
Low-GWP R454C refrigerant
Uses R454C, with a Global Warming Potential of under 150 — over ten times lower than legacy refrigerants used across much of the heat pump market.
Smart, app-based control
Optional integration into the home network and smartphone control (additional components required).
Technical specification
| Model identification |
| Product number (MPN) |
200123 |
| Electrical supply |
230V single-phase |
| Performance |
| SCOP 35°C (EN 14825) |
4.88 |
| Energy efficiency class, room heating |
A+++ (moderate climate) |
| Heating output at A2/W35 (EN 14511) |
4.30 kW |
| Heating output at A-7/W35 (EN 14511) |
6.87 kW |
| Cooling capacity at A35/W18 |
10.15 kW |
| COP at A2/W35 (EN 14511) |
4.30 |
| COP at A-7/W35 (EN 14511) |
2.93 |
| Energy efficiency ratio at A35/W18 |
2.87 |
| Sound power level (EN 12102) |
48 dB(A) |
| Operating limits |
| Min./max. application limits, heat source |
-25 / 40 °C |
| Min./max. application limits, heating side |
15 / 75 °C |
| Physical (outdoor unit) |
| Height |
900 mm |
| Width |
1270 mm |
| Depth |
593 mm |
| Weight |
135 kg |
| Refrigerant |
R454C |
| Colour |
White |
Used across the WPL-A Premium kit range
This is the same WPL-A 07 HK 230 Premium heat pump supplied in Stiebel Eltron's WPL-A Premium Pack 1–3 and Premium Compact Set kits, and in the ASHP 7.5kW Premium configurations shown separately below.
Help us prepare your custom quote
Because Stiebel Eltron configurations are matched to the property, please have the following ready when requesting a quote:
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System configuration – will the heat pump run as a stand-alone heat source, or in a bivalent arrangement alongside an existing boiler or secondary heat source?
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Hot water demand – what is the expected DHW usage volume for the property (occupants, bathrooms, peak draw-off), or is DHW production not required?
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Hydraulic layout – does the property use an S-plan or Y-plan hydraulic arrangement, or another zoned configuration?
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Pre-plumbed preference – would a pre-plumbed cylinder/buffer assembly be preferred to reduce on-site installation time?
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Secondary return – does the property require a secondary return circulation loop for the DHW system?
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Installation restrictions – are there any size or positioning restrictions for the outdoor unit or indoor cylinder?
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Electrical supply – is a single-phase or three-phase power supply available at the property?
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Pump groups – how many pump groups are required downstream of the buffer on the secondary (heating distribution) side?
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Control logic – should the system be controlled by the OEM heat pump manager, or integrated with a third-party room thermostat/BMS via Modbus or KNX?
Frequently asked questions
Is a cylinder included with this heat pump?
No – this page covers the outdoor heat pump unit only. It is supplied with a DHW cylinder and hydraulic kit in Stiebel Eltron's WPL-A Premium and ASHP 7.5kW Premium packs.
Why R454C rather than R290?
R454C is a low-GWP HFO-blend refrigerant (GWP under 150) used on Stiebel Eltron's Premium heat pump platform, distinct from the natural R290 refrigerant used on the newer HPA-O range. Both are significantly lower-GWP than legacy HFC refrigerants.
Can this heat pump provide cooling as well as heating?
Yes, it provides cooling during summer months in addition to heating and DHW support.
What flow temperature does this unit support?
Up to 75°C, making it suitable for retrofit properties with existing radiator circuits as well as new-build underfloor heating.
Why is pricing shown as 'on request'?
Every installation is specified to the property — cylinder, hydraulic kit and controls are matched to your needs, so pricing is confirmed once we know your configuration.
