versusindex
UK
Heat pumps · UK

ThermiaMega L

Thermia Mega L
Image: Thermiarequest removal

The Thermia Mega L is a heat pump with SCOP (35 °C) 6.8 and refrigerant R410A.1

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
Search this model
SCOP (35 °C)
6.81

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

Refrigerant
R410A1
Official source
Type (source)
Ground source1
Official source
Rated output 35 °C
51.32kW1
Official source
Rated output 55 °C
53.23kW1
Official source
UK

Rules in the UK

Boiler Upgrade Scheme

Not eligible

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 51.32 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 5.35. 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) Ground source1
Performance
Rated output 35 °C 51.32 kW1
Rated output 55 °C 53.23 kW1
Efficiency
SCOP (35 °C) 6.81
SCOP (55 °C) 5.351
Seasonal efficiency ηs 35 °C 264 %1
Seasonal efficiency ηs 55 °C 206 %1
Energy label 35 °C A, , , 1
Energy label 55 °C A, , , 1
Noise
Indoor unit sound power 43 dB(A)1
Refrigerant
Refrigerant R410A1
Refrigerant GWP 2,0881
Refrigerant charge 6.3 kg1

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:

  • Mega L
  • Mega L 2020

Manufacturer documentation

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

Frequently asked questions

What is the SCOP (35 °C) of the Thermia Mega L?

The SCOP (35 °C) of the Thermia Mega L is 6.8.1

Which refrigerant does the Thermia Mega L use?

The refrigerant of the Thermia Mega L is R410A.1

How much Boiler Upgrade Scheme grant can you get for the Thermia Mega L?

Probably none. Rated output 51.32 kW; the scheme covers systems up to 45 kW.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