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IGLOOMultiTherma 21 HD + MultiTherma BASIC 16-25

IGLOO MultiTherma 21 HD + MultiTherma BASIC 16-25
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The IGLOO MultiTherma 21 HD + MultiTherma BASIC 16-25 is an air-to-water heat pump with a SCOP of 4.29 (35 °C) and a sound power level of 56 dB(A).1,2

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SCOP (35 °C)
4.291

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)1
Official source
Refrigerant
R2901
Official source
Type (source)
Air-to-water1
Official source

Technical specifications

General
Type (source) Air-to-water1
Compressors 11
Capacity control drehzahlregelung1
Performance
Heating capacity (A7/W35) 6.29 kW2
Rated output 35 °C 8.42 kW1
Rated output 55 °C 8.02 kW1
Efficiency
SCOP (35 °C) 4.291
SCOP (55 °C) 3.231
Seasonal efficiency ηs 35 °C 169 %1
Seasonal efficiency ηs 55 °C 126 %1
Energy label 35 °C A, , 2
Energy label 55 °C A, , 2
COP A7/W35 5.021
COP A2/W35 4.251
COP A-7/W35 3.421
Noise
Outdoor unit sound power 56 dB(A)1
Indoor unit sound power 29 dB(A)1
Refrigerant
Refrigerant R2901
Refrigerant GWP 32
Refrigerant charge 2.2 kg1
Electrical
Max. power input 6.9 kW1
Connectivity & smart
SG Ready Yes1

Variants

This model is registered in 2 combinations (for example with a different indoor unit or cylinder) with exactly the same performance. All figures on this page apply to each of these types. The part of the type number that differs is in bold; small differences (e.g. cylinder volume or anode) are listed after it:

  • MultiTherma 21 HD + MultiTherma BASIC 16-25
  • MultiTherma 21 HD Cascade + MultiTherma BASIC 16-25

Manufacturer documentation

External links to IGLOO's official website. The manufacturer may change or move documents; where they differ, the manufacturer's latest version applies.

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Frequently asked questions

Which refrigerant does the IGLOO MultiTherma 21 HD + MultiTherma BASIC 16-25 use?

The IGLOO MultiTherma 21 HD + MultiTherma BASIC 16-25 uses R290.1,2

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