Updated
Daikin

Daikin Altherma 3 Heat Pump Range

Daikin's UK air-to-water heat pump platform. Monobloc variants 3 R / 3 H HT / 3 M plus R290 eco-line. SCOP up to 5.43; 10-yr warranty via D1 partners.

4.4 / 5
Highly recommended

Strengths

  • SCOP up to 5.43 at 35°C flow — class-leading published efficiency in the UK 2026 market
  • Reversible monobloc design provides summer cooling capability when paired with fan-coil emitters — almost unique among UK heat pumps in 2026
  • Operating envelope to −28°C ambient gives substantial headroom above the UK design temperature, so cold-weather performance derating is less of a concern than with most rivals

Watch outs

  • Standard warranty is 3 years parts and labour; extended cover to 10 years requires installation by a D1 Partner / Sustainable Home Network member — not all MCS-certified installers qualify
  • Most current Altherma 3 stock uses R32 (GWP 675); R290 (GWP 3) is restricted to the H MT R290 variant and a smaller pool of Stand By Me Certified Partner installers
  • The ONECTA / Madoka app interface is consistently flagged as more complex than competitors like Worcester EasyControl or Octopus Cosy
£7,000

Typical price — check Daikin UK Installer Network for live pricing.

Check price on Daikin UK Installer Network
  • Range Altherma 3 R (4–16 kW); Altherma 3 H HT (8–18 kW high-temperature); Altherma 3 M (4–16 kW compact); Altherma 3 H MT R290 (eco propane)
  • SCOP at 35°C flow Up to 5.43 (best variant)
  • COP at A7/W35 Up to 5.25
  • Energy class A+++ at 35°C flow

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Daikin Altherma 3 H HT monobloc heat pump outdoor unit installed at a UK home
By Editorial team2 min read
Range
Altherma 3 R (4–16 kW); Altherma 3 H HT (8–18 kW high-temperature); Altherma 3 M (4–16 kW compact); Altherma 3 H MT R290 (eco propane)
SCOP at 35°C flow
Up to 5.43 (best variant)
COP at A7/W35
Up to 5.25
Energy class
A+++ at 35°C flow
Maximum flow temperature
65°C (3 R), 70°C (3 H HT), 60°C (3 M)
Operating range
Down to −28°C ambient
Refrigerant
R32 (standard); R290 propane on the H MT R290 / EBLA / EWPA eco variant
Sound pressure at 3 m
38 dB(A) Standard Sound Mode; 35 dB(A) Low Sound Mode (3 H HT)
Outdoor sound power
43 – 48 dB(A)
Cooling capability
Reversible — supports summer cooling via compatible emitters
MCS approval
Listed under Daikin Airconditioning UK in MCS product database
£7,000 Daikin UK Installer Network
Check price on Daikin UK Installer Network