LG THERMA V R290 Monobloc S (HM121HFS.UB41)

Specifications and technical data

Also known as: HM121HFS UB41

Air Source (ASHP)ResidentialR29012 kW

Manufacturer	LG
Model	THERMA V R290 Monobloc S
Model code	HM121HFS.UB41
Heat pump type	Air Source (ASHP) All Air Source heat pumps →
Application	Residential All Residential heat pumps →
Refrigerant	R290 All R290 heat pumps →
Mode	Heating & cooling
Heating capacity	12 kW
Max heating output (low temp)	10 kW at A-7/W55
COP (heating)	4.6 at A7/W35
SCOP (heating)	4.75 at W35
Operating range (air)	-25 to 35 °C
Heating flow temperature	15–75 °C
Electrical supply	220-240V (Single Phase)
Cooling capacity	12 kW
Max cooling output (high temp)	10.05 kW at A35/W7
Cooling flow temperature	5–27 °C
EER (cooling)	3.2 at A35/W7
Dimensions (H×W×D)	1019 × 1320 × 520 mm
Operational Weight	131 kg
Sound power level	56 dB(A) (Sound Power LW(A))
Data added	2026-10-26
Data source	LG 2026 R290 Monobloc S leaflet (THERMA V)
Verification	Verified by a human

Free data sheet (PDF) →

Check noise at a neighbour’s window (MCS 020 a) →

LG THERMA V R290 Monobloc S HM121HFS.UB41, 12 kW air-to-water monobloc in the larger 1,320 mm chassis, natural R290. 12.0 kW at A7/W35 with a COP of 4.6, SCOP 4.75 at W35 (A+++) and 3.65 at W55 (A++). Reversible, 10.05 kW cooling at A35/W7. Flow to 75 C, runs down to -25 C. Sound power 56 dB(A). Single-phase.

Where to buy (UK)

UK Supplier	The Heat Pump Warehouse
UK Supplier	CoolEasy

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Data is compiled from manufacturer sources and may contain errors or gaps. Always confirm specifications with the manufacturer before making decisions.