Stiebel Eltron heat pumps

Air/water monoblocGround sourceWater sourceHot waterExhaust air 8 series

Stiebel Eltron is a German heating and hot water manufacturer based in Holzminden. Its heat pump range covers air-to-water units (WPL-A with R290, the older WPL series), ventilation-integrated units (LWZ), brine-to-water and water-to-water units (WPE-I, WPW-I) and hot water heat pumps (WWK). Control runs through the WPM heat pump manager; the ISG Connect gateway adds app access, SG Ready and Modbus TCP/IP.

Checked November 2, 2026 · Holzminden, Germany · Manufacturer website

Photo: Stiebel Eltron

Grant lists

BAFA WEP (Germany)

7 / 8 checked November 4, 2026

ZUM (Poland)

3 / 8 checked November 4, 2026

Stiebel Eltron in Zerofy

Zerofy has no integration for Stiebel Eltron yet. Where a series below has an SG Ready input, Zerofy can still switch it through a Shelly relay. The heat pump comparison lists every brand Zerofy supports.

Stiebel Eltron heat pump types

Air-to-water monoblock3 Ground-source (brine/water)2 Water-source1 Hot water heat pumps1 Exhaust-air heat pumps1

Stiebel Eltron Air-to-water monoblock

The whole refrigerant circuit sits in one outdoor unit; only water pipes run into the house. The most common choice for retrofits, because no refrigerant lines need to be installed inside.

Air/water monoblocR290

Stiebel Eltron WPL-A .2 Plus / Trend

9 models

Output: 4.7–17.1 kW
SCOP 35 °C: 4.55–5.35
Max. flow: 75 °C
BAFA WEP: 13 models listed
ZUM: 2 models listed
Zerofy: Via SG Ready

Details and listed models

Air/water monoblocR452B / R454C

Stiebel Eltron WPL-A Premium

4 models

Output: 4.4–12.6 kW
SCOP 35 °C: 4.31–4.88
Max. flow: 75 °C
BAFA WEP: 4 models listed
ZUM: No model on the list
Zerofy: Via SG Ready

Details and listed models

Air/water monoblocR410A

Stiebel Eltron WPL classic (R410A)

12 models

Output: 4.1–13.5 kW
SCOP 35 °C: 4.11–4.87
Max. flow: 65 °C
BAFA WEP: 13 models listed
ZUM: 1 model listed
Zerofy: Via SG Ready

Details and listed models

Stiebel Eltron Ground-source (brine/water)

Draws heat from a borehole or ground loop, so the source stays at a steady temperature all winter. Higher efficiency and no outdoor noise, but boreholes cost money and need a permit.

Ground sourceR454C

Stiebel Eltron WPE-I Premium

5 models

Output: 4.2–14.5 kW
SCOP 35 °C: 5.07–5.59
Max. flow: 75 °C
BAFA WEP: 20 models listed
ZUM: No model on the list
Zerofy: Via SG Ready

Details and listed models

Ground sourceR290 / R452B

Stiebel Eltron WPE-I Plus

8 models

Output: 7–16.7 kW
SCOP 35 °C: 4.79–5.4
Max. flow: –
BAFA WEP: 14 models listed
ZUM: 12 models listed
Zerofy: Via SG Ready

Details and listed models

Stiebel Eltron Water-source

Uses groundwater as the heat source. Very efficient, but needs a well and a water-rights permit, so it is rare in homes. Most ground-source models can be ordered in this variant.

Water sourceR410A

Stiebel Eltron WPW-I Premium

4 models

Output: 10–22.1 kW
SCOP 35 °C: 6.43–6.61
Max. flow: 65 °C
BAFA WEP: 4 models listed
ZUM: No model on the list
Zerofy: Via SG Ready

Details and listed models

Stiebel Eltron Hot water heat pumps

A small heat pump built onto a hot water tank. It heats drinking water only and is a good way to turn surplus solar into stored heat – or to add hot water to a house that is otherwise heated differently.

Hot waterR290

Stiebel Eltron WWK hot water heat pumps

4 models

Output: –
SCOP 35 °C: –
Max. flow: –
BAFA WEP: Not confirmed
ZUM: Not confirmed
Zerofy: Not supported

Details and listed models

Stiebel Eltron Exhaust-air heat pumps

Take their heat from the ventilation air leaving the house. Compact and quiet, suited to well-insulated houses and small heating loads.

Exhaust airR290 / R410A

Stiebel Eltron LWZ (ventilation-integrated)

6 models

Output: 4.8–6 kW
SCOP 35 °C: 4.14–4.28
Max. flow: –
BAFA WEP: 7 models listed
ZUM: No model on the list
Zerofy: Via SG Ready

Details and listed models

Stiebel Eltron series at a glance

Series	Type	Output	SCOP 35 °C	SCOP 55 °C	Refrigerant	Max. flow	BAFA WEP	ZUM	SG Ready	Modbus	EEBUS
WPL-A .2 Plus / Trend	Air/water monobloc	4.7–17.1 kW	4.55–5.35	3.78–4.08	R290	75 °C	13 models listed	2 models listed	Yes	Yes	–Not documented
WPL-A Premium	Air/water monobloc	4.4–12.6 kW	4.31–4.88	3.45–3.9	R452B / R454C	75 °C	4 models listed	No model on the list	Yes	Yes	–Not documented
WPL classic (R410A)	Air/water monobloc	4.1–13.5 kW	4.11–4.87	3.2–3.75	R410A	65 °C	13 models listed	1 model listed	Yes	Yes	–Not documented
WPE-I Premium	Ground source	4.2–14.5 kW	5.07–5.59	4.03–4.43	R454C	75 °C	20 models listed	No model on the list	Yes	Yes	–Not documented
WPE-I Plus	Ground source	7–16.7 kW	4.79–5.4	3.7–4.2	R290 / R452B	–	14 models listed	12 models listed	Yes	Yes	–Not documented
WPW-I Premium	Water source	10–22.1 kW	6.43–6.61	3.95–4.18	R410A	65 °C	4 models listed	No model on the list	Yes	Yes	–Not documented
WWK hot water heat pumps	Hot water	–	–	–	R290	–	Not confirmed	Not confirmed	?Not confirmed	?Not confirmed	?Not confirmed
LWZ (ventilation-integrated)	Exhaust air	4.8–6 kW	4.14–4.28	3.28–3.3	R290 / R410A	–	7 models listed	No model on the list	Yes	Yes	–Not documented

Heating output is the figure in the manufacturer's datasheet; the basis (nominal output at A7/W35 or B0/W35, or design heat load) differs between brands, so check the datasheet before comparing. * = design heat load Pdesignh at 35 °C from the BAFA portal.

Sources

Specifications come from the manufacturer's datasheets linked above, grant status from the official lists below, checked November 2, 2026:

SG Ready is a label of the Bundesverband Wärmepumpe (BWP) e.V.; “Yes” means the manufacturer documents the two-input interface or declares it on the BAFA portal, not that the series carries the BWP label – the label list is at waermepumpe.de. EEBUS is a standard of the EEBus Initiative e.V.; Modbus is a registered trademark of Schneider Electric, licensed to the Modbus Organization. Product names, logos and photos belong to their manufacturers and are shown to identify the products. Grant data: BAFA Wärmeerzeuger-Portal and Lista ZUM (IOŚ-PIB) as of the dates shown; the SCOP at 55 °C in the BAFA tables is calculated by Zerofy from the portal's ηs value.

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