Heat pumps · INT

STIEBEL ELTRON WPE-I 05 HW 400 Plus

The STIEBEL ELTRON WPE-I 05 HW 400 Plus is a heat pump with SCOP (35 °C) 3.48 and refrigerant R452B.^1,2

Last updated: November 1, 2026Technical specifications ⇄ Compare this model

SCOP (35 °C): 3.48²
Seasonal efficiency: how much heat you get per kWh of electricity across a heating season.
Refrigerant: R452B¹
Official source
Type (source): Ground source¹
Official source
Rated output 35 °C: 6kW²
Official source
Rated output 55 °C: 6kW²
Official source

Technical specifications

General
Type (source)	Ground source¹
Performance
Rated output 35 °C	6 kW²
Rated output 55 °C	6 kW²
Efficiency
SCOP (35 °C)	3.48²
SCOP (55 °C)	3.45²
Seasonal efficiency ηs 35 °C	136 %²
Seasonal efficiency ηs 55 °C	135 %²
Energy label 35 °C	A+++²
Energy label 55 °C	A++²
Noise
Indoor unit sound power	42 dB(A)²
Refrigerant
Refrigerant	R452B¹
Refrigerant GWP	698¹
Refrigerant charge	0.58 kg¹

How it ranks

SCOP (35 °C): better than 0% of comparable models in our database (Heat pumps · Ground source · 6–8 kW; n = 38).

Rank 38 of 39

Compared with every model on VersusIndex in the same group with a known value; equal values do not count as better. This says nothing about price, installation or reliability.

Similar models

Other brands, same type and a comparable size.

Frequently asked questions

What is the SCOP (35 °C) of the STIEBEL ELTRON WPE-I 05 HW 400 Plus?

The SCOP (35 °C) of the STIEBEL ELTRON WPE-I 05 HW 400 Plus is 3.48.^1,2

Which refrigerant does the STIEBEL ELTRON WPE-I 05 HW 400 Plus use?

The refrigerant of the STIEBEL ELTRON WPE-I 05 HW 400 Plus is R452B.^1,2

Sources

Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed Sep 29, 2026
European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed Nov 1, 2026

Key figures