The Stiebel Eltron HPA-O Trend range is a value-focused monobloc air source heat pump platform for outdoor installation, using the natural refrigerant R290 at an optimum price-performance ratio. It spans six capacities from 4.91 kW to 17.36 kW at A-7/W35, across single-phase (HC 230) and three-phase (HC 400) electrical supplies. Use the table below to compare sizes.
4.91–17.36 kW
Output Range (A-7/W35)
HC 230 / HC 400
Electrical Options
Dark grey RAL 7021
Colour
Pricing on request
Every configuration on this page 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.
R290 refrigerant – installation clearances apply
These units use the natural refrigerant R290 (propane), which is mildly flammable (A3 classification). Installation must follow Stiebel Eltron's clearance and ventilation requirements for the refrigerant charge size, and electrical connection must be carried out by a competent electrician to Part P and BS 7671. Grid-connected units require a DNO notification (G98/G99) prior to commissioning.
Key features
Natural R290 refrigerant
Uses the natural refrigerant R290 (propane), GWP of just 3, future-proofed against F-Gas phase-down schedules affecting HFC refrigerants.
Inverter-matched heating output
A variable-speed inverter compressor matches heating output to demand rather than cycling on/off, keeping efficiency high across the full range of outdoor temperatures.
Heating and active cooling
Active cooling by circuit reversal is available when paired with a compatible area heating system such as underfloor heating.
High flow temperature for retrofit
Supports flow temperatures up to 75 °C on the heating side, suitable for retrofit properties with radiators as well as new-build underfloor systems.
Smart, app-based control
Control via the MyStiebel app is possible with the ISG accessory, alongside Modbus/KNX integration for home automation and PV self-consumption.
Choose your size
| Model |
MPN |
Electrical supply |
Output (A-7/W35) |
SCOP 35°C |
Sound power |
| HPA-O 05.2 Trend HC 230 |
207419 |
HC 230 (single-phase 230V) |
4.91 kW |
4.69 |
44 dB(A) |
| HPA-O 07.2 Trend HC 230 |
207420 |
HC 230 (single-phase 230V) |
6.92 kW |
4.67 |
44 dB(A) |
| HPA-O 10.2 Trend HC 230 |
207422 |
HC 230 (single-phase 230V) |
9.49 kW |
4.59 |
46 dB(A) |
| HPA-O 13.2 Trend HC 230 |
207424 |
HC 230 (single-phase 230V) |
12.47 kW |
4.65 |
49 dB(A) |
| HPA-O 13.2 Trend HC 400 |
207425 |
HC 400 (three-phase 400V) |
12.47 kW |
4.65 |
49 dB(A) |
| HPA-O 17.2 Trend HC 400 |
207426 |
HC 400 (three-phase 400V) |
17.36 kW |
4.55 |
52 dB(A) |
Full technical specification
| Specification |
HPA-O 05.2 Trend HC 230 |
HPA-O 07.2 Trend HC 230 |
HPA-O 10.2 Trend HC 230 |
HPA-O 13.2 Trend HC 230 |
HPA-O 13.2 Trend HC 400 |
HPA-O 17.2 Trend HC 400 |
| Product number (MPN) |
207419 |
207420 |
207422 |
207424 |
207425 |
207426 |
| Electrical supply |
HC 230 (single-phase 230V) |
HC 230 (single-phase 230V) |
HC 230 (single-phase 230V) |
HC 230 (single-phase 230V) |
HC 400 (three-phase 400V) |
HC 400 (three-phase 400V) |
| SCOP 35°C (EN 14825) |
4.69 |
4.67 |
4.59 |
4.65 |
4.65 |
4.55 |
| SCOP 55°C (EN 14825) |
3.85 |
3.83 |
3.79 |
3.85 |
3.85 |
3.83 |
| Energy efficiency class, room heating |
– |
– |
A++ |
– |
A+++ |
– |
| Heating output at A2/W35 (EN 14511) |
3.02 kW |
4.24 kW |
5.87 kW |
4.09 kW |
7.45 kW |
10.29 kW |
| Heating output at A-7/W35 (EN 14511) |
4.91 kW |
6.92 kW |
9.49 kW |
12.47 kW |
12.47 kW |
17.36 kW |
| Cooling capacity at A35/W18 |
– |
– |
8.94 kW |
– |
– |
– |
| COP at A2/W35 (EN 14511) |
4.04 |
4.02 |
3.96 |
4.54 |
3.91 |
3.91 |
| COP at A-7/W35 (EN 14511) |
2.86 |
2.84 |
2.80 |
2.75 |
2.75 |
2.62 |
| Sound power level (EN 12102) |
44 dB(A) |
44 dB(A) |
46 dB(A) |
49 dB(A) |
49 dB(A) |
52 dB(A) |
| Height |
960 mm |
960 mm |
960 mm |
1144 mm |
1144 mm |
1365 mm |
| Width |
1170 mm |
1170 mm |
1170 mm |
1170 mm |
1170 mm |
1170 mm |
| Depth |
727 mm |
727 mm |
727 mm |
727 mm |
727 mm |
727 mm |
| Weight |
148 kg |
149 kg |
150 kg |
176 kg |
176 kg |
209 kg |
| Colour |
Dark grey RAL 7021 |
Dark grey RAL 7021 |
Dark grey RAL 7021 |
Dark grey RAL 7021 |
Dark grey RAL 7021 |
Dark grey RAL 7021 |
– indicates a figure not separately published by the manufacturer for that model.
Smart control ready
Add the ISG accessory for MyStiebel app control and installer remote diagnostics, and integrate with Modbus or KNX for home automation.
Help us prepare your custom quote
Because Stiebel Eltron configurations are matched to the property, please have the following ready when requesting a quote:
-
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?
-
Hydraulic layout – does the property use an S-plan or Y-plan hydraulic arrangement, or another zoned configuration?
-
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?
-
Installation restrictions – are there any size or positioning restrictions for the outdoor unit or indoor cylinder?
-
Electrical supply – is a single-phase (HC 230) or three-phase (HC 400) power supply available at the property?
-
Pump groups – how many pump groups are required downstream of the buffer on the secondary (heating distribution) side?
-
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 these heat pumps?
No – this page covers the outdoor heat pump units only. Each is paired with a DHW cylinder, buffer volume and hydraulic kit selected to suit the property. See our matching set pages for pre-configured cylinder pairings.
What is the difference between HC 230 and HC 400 versions?
HC 230 units run on a single-phase 230V electrical supply, while HC 400 units require a three-phase 400V supply. Larger outputs in the range are only available as HC 400.
Why does this range use R290 instead of a common HFC refrigerant?
R290 (propane) is a natural refrigerant with a Global Warming Potential of around 3, compared with hundreds or thousands for many HFC refrigerants. It is mildly flammable, so installation clearances and ventilation requirements must be followed.
Can these heat pumps provide cooling as well as heating?
Yes. Active cooling is available by circuit reversal when the unit is paired with a compatible area heating system, such as underfloor heating.
How do I choose between the HPA-O Trend sizes?
Sizing should be based on the property's calculated heat loss, not on output figures alone — contact us with your heat loss survey and we'll confirm the right size.
Why is pricing shown as 'on request'?
Every installation is specified to the property, so pricing is confirmed once we know your configuration. Use the questions below or contact our technical team for a tailored quotation.
