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Heat pumps · UK

DimplexLIA 1316 + LIA BW

The Dimplex LIA 1316 + LIA BW is an air-to-water heat pump with a SCOP of 4.72 (35 °C) and a sound power level of 65 dB(A). Under permitted development the limit is 37 dB(A) measured 1 m in front of the centre of a neighbour’s habitable-room door or window. Free-standing, the indicative minimum distance is 10.0 m; against a wall 14.2 m.1

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
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SCOP (35 °C)
4.721

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

Heating capacity (A7/W35)
14.5kW1
Official source
Outdoor unit sound power
65dB(A)1
Official source
Refrigerant
R321
Official source
Type (source)
Air-to-water1
Official source
UK

Rules in the UK

Minimum distance to your neighbour

MCS 020(a) (England, permitted development since 29 May 2025)2 · 1 m in front of the centre of a neighbour’s habitable-room door or window

Permitted development (MCS 020(a)) ≤ 37 dB(A) · LAeq,5min
Free-standing 10 m
Against wall 14.2 m
In corner 20 m

Indicative calculation (hemispherical, no barriers). Not a substitute for an MCS 020 assessment.

Boiler Upgrade Scheme

Check conditions

£7,500 – £9,0003Fixed 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.4,5

  • Must be MCS-certified (product and installer). Check the Ofgem product eligibility list.
  • Rated output 13.73 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 3.47. 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) Air-to-water1
Performance
Heating capacity (A7/W35) 14.5 kW1
Rated output 35 °C 13.73 kW1
Rated output 55 °C 12.08 kW1
Min. outdoor temperature -22 °C1
Efficiency
SCOP (35 °C) 4.721
SCOP (55 °C) 3.471
Seasonal efficiency ηs 35 °C 186 %1
Seasonal efficiency ηs 55 °C 136 %1
Energy label 35 °C A, , , 1
Energy label 55 °C A, , 1
COP A7/W35 4.71
Noise
Outdoor unit sound power 65 dB(A)1
Indoor unit sound power 43 dB(A)1
Refrigerant
Refrigerant R321
Refrigerant GWP 6751
Refrigerant charge 1.84 kg1

Variants

This model is registered in 4 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:

  • LIA 1316 + LIA BW
  • LIA 1316 + LIA HX
  • LIA 1316 M + LIA BW
  • LIA1316 M + LIA HX

Frequently asked questions

Can I install the Dimplex LIA 1316 + LIA BW without planning permission?

Under MCS 020(a) (England, permitted development since 29 May 2025) the unit must not exceed 37 dB(A) 1 m in front of the centre of a neighbour’s habitable-room door or window. With a sound power of 65 dB(A) that indicatively means 10.0 m free-standing, 14.2 m against a wall or 20.0 m in a corner. Your MCS installer must confirm this.1

How much Boiler Upgrade Scheme grant can you get for the Dimplex LIA 1316 + LIA BW?

£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

Which refrigerant does the Dimplex LIA 1316 + LIA BW use?

The Dimplex LIA 1316 + LIA BW uses R32.1

Sources

  1. Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026
  2. MCS 020(a) (England, permitted development since 29 May 2025)
  3. Boiler Upgrade Scheme: what you can get — GOV.UK · accessed 27 Sept 2026
  4. Boiler Upgrade Scheme: guidance for installers (V5) — Ofgem · accessed 27 Sept 2026
  5. Boiler Upgrade Scheme product eligibility — Ofgem · accessed 27 Sept 2026