The Stiebel Eltron ASHP 7.5kW Premium / 225 Plus Compact Pack pairs the WPL-A 07 HK 230 Premium air source heat pump (R454C refrigerant, up to 75 °C flow) with the ultra-lightweight HSBC 225 S1 tank-on-tank DHW cylinder. This lightweight, pre-plumbed and pre-wired stainless steel cylinder combination is suited to properties limited on space or needing an upstairs installation, with the main controller mounted on the front of the cylinder.
6.87 kW
Heating Output (A-7/W35)
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.
Pack components
- WPL-A 07 HK 230 Premium – air source heat pump
- HSBC 225 S1 – ultra-lightweight DHW cylinder
- ISG web – Internet Service Gateway
- FET – room thermostat / control accessory
- FS-WP 28 – filter
Key features
Inverter technology
Variable-speed compressor for high efficiency and low energy bills.
Heating and active cooling
Provides cooling in summer months alongside heating and DHW support.
High flow temperature
Flow temperatures up to 75°C support both retrofit radiator circuits and new-build underfloor heating.
Low-GWP refrigerant
R454C refrigerant, GWP under 150.
Technical specification
| Model identification |
| Product number (MPN) |
206044 |
| Heat pump |
WPL-A 07 HK 230 Premium (200123) |
| Heat pump performance |
| SCOP 35°C (EN 14825) |
4.88 |
| 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 |
| 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 |
| Refrigerant |
| Refrigerant |
R454C (GWP <150) |
Smart control included
The pack includes the Internet Service Gateway (ISG web) for MyStiebel app control and installer remote diagnostics, plus a room thermostat (FET) to monitor property temperature.
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 pack?
Yes – this pack includes the ultra-lightweight HSBC 225 S1 tank-on-tank DHW cylinder alongside the WPL-A 07 HK 230 Premium heat pump.
What refrigerant does this heat pump use?
R454C, a low-GWP HFO-blend refrigerant with a Global Warming Potential under 150.
Can this pack provide cooling as well as heating?
Yes, active cooling is available in addition to heating and DHW support.
What flow temperature does this pack support?
Up to 75°C, suitable for retrofit properties with radiators as well as new-build underfloor heating.
Why is pricing shown as 'on request'?
Stiebel Eltron packs are matched to the property; we confirm the full specification and cost with you directly before quoting.
