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Heat pumps · UK

Mitsubishi ElectricEHWT17D-MHEDW

The Mitsubishi Electric EHWT17D-MHEDW is a heat pump with SCOP (35 °C) 6.87 and refrigerant R32.1

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
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SCOP (35 °C)
6.871

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

Refrigerant
R321
Official source
Type (source)
Water-to-water1
Official source
Rated output 35 °C
7kW1
Official source
Rated output 55 °C
7kW1
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 7 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 4.69. 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
Performance
Rated output 35 °C 7 kW1
Rated output 55 °C 7 kW1
Efficiency
SCOP (35 °C) 6.871
SCOP (55 °C) 4.691
Seasonal efficiency ηs 35 °C 267 %1
Seasonal efficiency ηs 55 °C 180 %1
Energy label 35 °C A, , , 1
Energy label 55 °C A, , , 1
Noise
Indoor unit sound power 38 dB(A)1
Refrigerant
Refrigerant R321
Refrigerant GWP 6751
Refrigerant charge 0.9 kg1

Frequently asked questions

What is the SCOP (35 °C) of the Mitsubishi Electric EHWT17D-MHEDW?

The SCOP (35 °C) of the Mitsubishi Electric EHWT17D-MHEDW is 6.87.1

Which refrigerant does the Mitsubishi Electric EHWT17D-MHEDW use?

The refrigerant of the Mitsubishi Electric EHWT17D-MHEDW is R32.1

How much Boiler Upgrade Scheme grant can you get for the Mitsubishi Electric EHWT17D-MHEDW?

£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. Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 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