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Heat pumps · UK

iDMTERRA SW 13 Twin H (Wasser / Wasser)

The iDM TERRA SW 13 Twin H (Wasser / Wasser) is a heat pump with SCOP (35 °C) 5.49 and refrigerant R134A.1

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
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SCOP (35 °C)
5.491

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

Refrigerant
R134A1
Official source
Type (source)
Water-to-water1
Official source
Rated output 35 °C
15.9kW1
Official source
Rated output 55 °C
14.6kW1
Official source
UK

Rules in the UK

Boiler Upgrade Scheme

Check conditions

£7,500 – £9,0002Fixed grant (England & Wales)

Fixed grant in England and Wales, deducted from your installer’s quote. £9,000 when replacing oil or LPG off the gas grid (until March 2027). Scotland: Home Energy Scotland grant instead.3,4

  • Must be MCS-certified (product and installer). Check the Ofgem product eligibility list.
  • Rated output 15.9 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 4.6. The installed system needs a SCOP of at least 2.8 (MCS calculation).
Heat pump grants in the UK explained →

Technical specifications

General
Type (source) Water-to-water1
Compressors 21
Capacity control leistungsstufen1
Performance
Rated output 35 °C 15.9 kW1
Rated output 55 °C 14.6 kW1
Efficiency
SCOP (35 °C) 5.491
SCOP (55 °C) 4.61
Seasonal efficiency ηs 35 °C 212 %1
Seasonal efficiency ηs 55 °C 176 %1
Noise
Indoor unit sound power 50 dB(A)1
Refrigerant
Refrigerant R134A1
Refrigerant charge 4.8 kg1
Electrical
Max. power input 5.72 kW1
Connectivity & smart
SG Ready Yes1

Frequently asked questions

What is the SCOP (35 °C) of the iDM TERRA SW 13 Twin H (Wasser / Wasser)?

The SCOP (35 °C) of the iDM TERRA SW 13 Twin H (Wasser / Wasser) is 5.49.1

Which refrigerant does the iDM TERRA SW 13 Twin H (Wasser / Wasser) use?

The refrigerant of the iDM TERRA SW 13 Twin H (Wasser / Wasser) is R134A.1

How much Boiler Upgrade Scheme grant can you get for the iDM TERRA SW 13 Twin H (Wasser / Wasser)?

£7,500 in England and Wales, provided the product and installer are MCS-certified (£9,000 when replacing oil or LPG off the gas grid, until March 2027). The installer applies and deducts the grant from your quote.1

Sources

  1. List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 28 Sept 2026
  2. Boiler Upgrade Scheme: what you can get — GOV.UK · accessed 27 Sept 2026
  3. Boiler Upgrade Scheme: guidance for installers (V5) — Ofgem · accessed 27 Sept 2026
  4. Boiler Upgrade Scheme product eligibility — Ofgem · accessed 27 Sept 2026