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Heat pumps · MT

IGLOO MultiTherma 21 HD + ElectroBox

The IGLOO MultiTherma 21 HD + ElectroBox is an air-to-water heat pump with a SCOP of 4.45 (35 °C) and a sound power level of 56 dB(A).1,2,3

Last updated: Technical specificationsRules in Malta⇄ Compare this model
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SCOP (35 °C)
4.453

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

Heating capacity (A7/W35)
6.29kW2
Official source
Outdoor unit sound power
56dB(A)3
Official source
Refrigerant
R2901
Official source
Type (source)
Air-to-water1
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
Heating capacity (A7/W35)6.29 kW2
Rated output 35 °C8 kW3
Rated output 55 °C8 kW3
Efficiency
SCOP (35 °C)4.453
Seasonal efficiency ηs 35 °C175 %3
Seasonal efficiency ηs 55 °C175 %3
Energy label 35 °CA+++3
Energy label 55 °CA++3
COP A7/W355.171
COP A2/W354.251
COP A-7/W353.421
Noise
Outdoor unit sound power56 dB(A)3
Refrigerant
RefrigerantR2901
Refrigerant GWP32
Refrigerant charge2.2 kg1
Electrical
Max. power input6.9 kW1
Connectivity & smart
SG ReadyYes1

How it ranks

SCOP (35 °C): better than 7% of comparable models in our database (Heat pumps · Air-to-water · 8–10 kW; n = 171).

Rank 158 of 172

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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How we collect and check this data →

Frequently asked questions

Which refrigerant does the IGLOO MultiTherma 21 HD + ElectroBox use?

The IGLOO MultiTherma 21 HD + ElectroBox uses R290.1,2,3

Sources

  1. List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026
  2. Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026
  3. European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 15 Oct 2026
  4. Water Heater Scheme (heat pump water heaters) — Regulator for Energy and Water Services (REWS)