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Heat pumps · MT

STIEBEL ELTRON WPL 13 ACS classic

The STIEBEL ELTRON WPL 13 ACS classic is an air-to-water heat pump with a SCOP of 4.5 (35 °C) and a sound power level of 57 dB(A).1,2

Last updated: Technical specificationsRules in Malta⇄ Compare this model
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SCOP (35 °C)
4.52

Seasonal efficiency: how much heat you get per kWh of electricity across a heating season.

Outdoor unit sound power
57dB(A)2
Official source
Refrigerant
R410A1
Official source
Type (source)
Air-to-water1
Official source
Rated output 35 °C
7kW2
Official source
MT

Rules in Malta

Water Heater Scheme (heat pump water heaters)

Unknown

REWS runs a national grant scheme for energy-efficient water heaters in homes; heat pump water heaters are eligible (alongside solar water heaters). The scheme has been extended to 31 December 2026, and part A of the application must be submitted before you buy and install the equipment. Grant amounts: see the REWS page (not verified by us).

Technical specifications

General
Type (source)Air-to-water1
Compressors11
Capacity controldrehzahlregelung1
Performance
Rated output 35 °C7 kW2
Rated output 55 °C8 kW2
Efficiency
SCOP (35 °C)4.52
SCOP (55 °C)3.22
Seasonal efficiency ηs 35 °C177 %2
Seasonal efficiency ηs 55 °C125 %2
Energy label 35 °CA+++2
Energy label 55 °CA++2
COP A7/W354.761
COP A2/W353.971
COP A-7/W352.921
Noise
Outdoor unit sound power57 dB(A)2
Indoor unit sound power27 dB(A)1
Refrigerant
RefrigerantR410A1
Refrigerant charge2 kg1
Electrical
Max. power input4.6 kW1
Connectivity & smart
SG ReadyYes1

How it ranks

SCOP (35 °C): better than 21% of comparable models in our database (Heat pumps · Air-to-water · 6–8 kW; n = 182).

Rank 142 of 183

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.

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Frequently asked questions

Which refrigerant does the STIEBEL ELTRON WPL 13 ACS classic use?

The STIEBEL ELTRON WPL 13 ACS classic uses R410A.1,2

Sources

  1. List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 29 Sept 2026
  2. European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 15 Oct 2026
  3. Water Heater Scheme (heat pump water heaters) — Regulator for Energy and Water Services (REWS)