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HEAT PUMPS

LG HM121MR U34

UK configuration

Exact manufacturer unit purpose
R32 Monobloc S, 1Ø, 12kW HM121MR U34
Manufacturer heating capacities at separate operating points
12.00 kW (A+7/W+35); 11.00 kW (A+2/W+35); 11.00 kW (A+7/W+55)
Manufacturer cooling capacities at separate operating points
12.00 kW (A+35/W+18); 12.00 kW (A+35/W+7)

LG HM121MR U34 in the exact manufacturer-listed UK configuration.

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THE ACTUAL PRODUCT
Front view of R32 Monobloc S, 1Ø, 12kW HM121MR U34
Official product image · Image source detailsProduct imagery does not establish a retailer’s bundle or condition.
Compare with LG HN1600MC NK1 + HU121MRB U30

Specifications checked 19 Oct 2026Manufacturer specifications, not a hands-on test.

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Front view of R32 Hydrosplit Hydro Box, 1Ø, 12kW HN1600MC NK1 + HU121MRB U30LG HN1600MC NK1 + HU121MRB U30UK manufacturer configuration · HN1600MC NK1 + HU121MRB U30
Exact manufacturer unit purpose
R32 Hydrosplit Hydro Box, 1Ø, 12kW HN1600MC NK1 + HU121MRB U30This one: R32 Monobloc S, 1Ø, 12kW HM121MR U34
Manufacturer efficiency declarations and source methods
Seasonal space heating eff. class (35℃ / 55℃) A+++/A++; Seasonal space heating efficiency (ηS) (35℃ / 55℃) 181 / 137; SCOP (35℃ / 55℃) 4.60 / 3.50; COP 5.04 (A+7/W+35); COP 3.65 (A+2/W+35); COP 2.90 (A+7/W+55); EER 4.75 (A+35/W+18); EER 2,70 (A+35/W+7)This one: EER 4.75 (A+35/W+18); EER 3.30 (A+35/W+7); COP 4.90 (A+7/W+35); COP 3.65 (A+2/W+35); COP 2.90 (A+7/W+55); SCOP (35℃ / 55℃) 4.67 / 3.47; Seasonal space heating eff. class (35℃ / 55℃) A+++/A++; Seasonal space heating efficiency (ηS) (35℃ / 55℃) 184 / 136
Front view of R32 Hydrosplit IWT, 1Ø, 12kW HN1616Y NB1 + HU121MRB U30LG HN1616Y NB1 + HU121MRB U30UK manufacturer configuration · HN1616Y NB1 + HU121MRB U30
Exact manufacturer unit purpose
R32 Hydrosplit IWT, 1Ø, 12kW HN1616Y NB1 + HU121MRB U30This one: R32 Monobloc S, 1Ø, 12kW HM121MR U34
Manufacturer efficiency declarations and source methods
Seasonal space heating eff. class (35℃ / 55℃) A+++/A++; Seasonal space heating efficiency (ηS) (35℃ / 55℃) 181 / 137; SCOP (35℃ / 55℃) 4.60 / 3.50; Water heating eff. class, average climate A+; Water heating efficiency (ηWH), average climate 120; COP 5.04 (A+7/W+35); COP 3.65 (A+2/W+35); COP 2.90 (A+7/W+55); EER 4.75 (A+35/W+18); EER 2,70 (A+35/W+7)This one: EER 4.75 (A+35/W+18); EER 3.30 (A+35/W+7); COP 4.90 (A+7/W+35); COP 3.65 (A+2/W+35); COP 2.90 (A+7/W+55); SCOP (35℃ / 55℃) 4.67 / 3.47; Seasonal space heating eff. class (35℃ / 55℃) A+++/A++; Seasonal space heating efficiency (ηS) (35℃ / 55℃) 184 / 136
Front view of R32 Monobloc S, 1Ø, 5kW HM051MR U44LG HM051MR U44UK manufacturer configuration · HM051MR U44
Exact manufacturer unit purpose
R32 Monobloc S, 1Ø, 5kW HM051MR U44This one: R32 Monobloc S, 1Ø, 12kW HM121MR U34
Manufacturer heating capacities at separate operating points
4.40 kW (A+2/W+35); 5.50 kW (A+7/W+35); 5.50 kW (A+7/W+55)This one: 12.00 kW (A+7/W+35); 11.00 kW (A+2/W+35); 11.00 kW (A+7/W+55)
The useful part.

Key strengths

The official LG UK page identifies manufacturer model HM121MR U34.

The checks that matter.

Before you buy

Manufacturer claims do not establish independently measured performance, current retailer stock or price. Unlisted specifications remain explicitly unknown.

Every specification. With its source.

Full specifications

Exact configuration: UK manufacturer configuration · HM121MR U34

30 specifications in 5 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”. 8 rows repeat listed facts in the manufacturer’s own wording, kept under “Manufacturer wording”.

Heating, cooling & efficiency

13 items
Manufacturer heating capacities at separate operating points
12.00 kW (A+7/W+35); 11.00 kW (A+2/W+35); 11.00 kW (A+7/W+55)

Each declaration has its own manufacturer operating point, component, measurement method or electrical basis. They are not equivalent unqualified figures. NOMINAL CAPACITY AND COP (A+7/W+35) — Heating capacity (kW): 12.00; NOMINAL CAPACITY AND COP (A+2/W+35) — Heating capacity (kW): 11.00; NOMINAL CAPACITY AND COP (A+7/W+55) — Heating capacity (kW): 11.00. Heating/cooling output is separate from electrical consumption and supply. Sound power and sound pressure remain separately labelled in the original rows. No COP/SCOP/EER/SEER conversion, seasonal average or ranking is calculated.

Source
Manufacturer cooling capacities at separate operating points
12.00 kW (A+35/W+18); 12.00 kW (A+35/W+7)

Each declaration has its own manufacturer operating point, component, measurement method or electrical basis. They are not equivalent unqualified figures. NOMINAL CAPACITY AND EER (A+35/W+18) — Cooling capacity (kW): 12.00; NOMINAL CAPACITY AND EER (A+35/W+7) — Cooling capacity (kW): 12.00. Heating/cooling output is separate from electrical consumption and supply. Sound power and sound pressure remain separately labelled in the original rows. No COP/SCOP/EER/SEER conversion, seasonal average or ranking is calculated.

Source
Manufacturer efficiency declarations and source methods
EER 4.75 (A+35/W+18); EER 3.30 (A+35/W+7); COP 4.90 (A+7/W+35); COP 3.65 (A+2/W+35); COP 2.90 (A+7/W+55); SCOP (35℃ / 55℃) 4.67 / 3.47; Seasonal space heating eff. class (35℃ / 55℃) A+++/A++; Seasonal space heating efficiency (ηS) (35℃ / 55℃) 184 / 136

Each declaration has its own manufacturer operating point, component, measurement method or electrical basis. They are not equivalent unqualified figures. NOMINAL CAPACITY AND EER (A+35/W+18) — EER: 4.75; NOMINAL CAPACITY AND EER (A+35/W+7) — EER: 3.30; NOMINAL CAPACITY AND COP (A+7/W+35) — COP: 4.90; NOMINAL CAPACITY AND COP (A+2/W+35) — COP: 3.65; NOMINAL CAPACITY AND COP (A+7/W+55) — COP: 2.90; SEASONAL EFFICIENCY DATA — SCOP (35℃ / 55℃): 4.67 / 3.47; SEASONAL EFFICIENCY DATA — Seasonal space heating eff. class (35℃ / 55℃): A+++/A++; SEASONAL EFFICIENCY DATA — Seasonal space heating efficiency (ηS) (35℃ / 55℃): 184 / 136. Heating/cooling output is separate from electrical consumption and supply. Sound power and sound pressure remain separately labelled in the original rows. No COP/SCOP/EER/SEER conversion, seasonal average or ranking is calculated.

Source
NOMINAL CAPACITY AND EER (A+35/W+18) — Cooling capacity (kW)
12.00Source
NOMINAL CAPACITY AND EER (A+35/W+18) — EER
4.75Source
NOMINAL CAPACITY AND EER (A+35/W+7) — EER
3.30Source
NOMINAL CAPACITY AND COP (A+7/W+35) — COP
4.90Source
NOMINAL CAPACITY AND COP (A+2/W+35) — COP
3.65Source
NOMINAL CAPACITY AND COP (A+2/W+35) — Heating capacity (kW)
11.00Source
NOMINAL CAPACITY AND COP (A+7/W+55) — COP
2.90Source
SEASONAL EFFICIENCY DATA — SCOP (35℃ / 55℃)
4.67 / 3.47Source
SEASONAL EFFICIENCY DATA — Seasonal space heating eff. class (35℃ / 55℃)
A+++/A++Source
SEASONAL EFFICIENCY DATA — Seasonal space heating efficiency (ηS) (35℃ / 55℃)
184 / 136Source
Manufacturer wording (3)

The same facts in the manufacturer’s combined or original wording, each with its source.

NOMINAL CAPACITY AND EER (A+35/W+7) — Cooling capacity (kW)
12.00Source
NOMINAL CAPACITY AND COP (A+7/W+35) — Heating capacity (kW)
12.00Source
NOMINAL CAPACITY AND COP (A+7/W+55) — Heating capacity (kW)
11.00Source

Refrigerant & circuit

3 items
Manufacturer refrigerant type
R32

Each declaration has its own manufacturer operating point, component, measurement method or electrical basis. They are not equivalent unqualified figures. REFRIGERANT — Type: R32. Heating/cooling output is separate from electrical consumption and supply. Sound power and sound pressure remain separately labelled in the original rows. No COP/SCOP/EER/SEER conversion, seasonal average or ranking is calculated.

Source
REFRIGERANT — GWP
675Source
REFRIGERANT — Precharged amount (g)
2,000Source
Manufacturer wording (1)

The same facts in the manufacturer’s combined or original wording, each with its source.

REFRIGERANT — Type
R32Source

Electrical supply & consumption

1 item
Manufacturer electrical supply requirements
220-240, 1, 50

Each declaration has its own manufacturer operating point, component, measurement method or electrical basis. They are not equivalent unqualified figures. POWER SUPPLY — Voltage, phase, frequency (V, Ø, Hz): 220-240, 1, 50. Heating/cooling output is separate from electrical consumption and supply. Sound power and sound pressure remain separately labelled in the original rows. No COP/SCOP/EER/SEER conversion, seasonal average or ranking is calculated.

Source
Manufacturer wording (1)

The same facts in the manufacturer’s combined or original wording, each with its source.

POWER SUPPLY — Voltage, phase, frequency (V, Ø, Hz)
220-240, 1, 50Source

Installation, dimensions & airflow

5 items
Exact manufacturer unit purpose
R32 Monobloc S, 1Ø, 12kW HM121MR U34

Exact manufacturer Product heading. Official current catalogue classes: Heating Solution(AWHP). Indoor, outdoor, hydro and whole-package purposes are not substituted for one another.

Source
Manufacturer dimensions and configuration basis
Not listed by the manufacturer

The manufacturer does not supply complete, unambiguous unit-labelled dimensions for the relevant product/components. Original declarations: none. Missing units or malformed component values are not guessed. · The manufacturer does not supply complete, unambiguous unit-labelled dimensions for the relevant product/components. Original declarations: none. Missing units or malformed component values are not guessed.

Source
PIPING CONNECTIONS (WATER) — Inlet diameter (inch)
Male PT 1"Source
EXTERIOR — Color
Warm graySource
EXTERIOR — RAL code
RAL 7044Source
Manufacturer wording (1)

The same facts in the manufacturer’s combined or original wording, each with its source.

PIPING CONNECTIONS (WATER) — Outlet diameter (inch)
Male PT 1"Source

Operating conditions & sound

8 items
SOUND POWER LEVEL — Rated / low noise mode (dB(A))
60 / 56Source
SOUND PRESSURE LEVEL AT 1M (CONVERT USING SWL) — Rated / low noise mode (dB(A))
52 / 48Source
SOUND PRESSURE LEVEL AT 5M (CONVERT USING SWL) — Rated / low noise mode (dB(A))
38 / 34Source
OPERATION RANGE (LEAVING WATER TEMPERATURE) — Cooling (Min. ~ Max.) (℃)
5 ~ 27Source
OPERATION RANGE (LEAVING WATER TEMPERATURE) — Heating (Min. ~ Max.) (℃)
15 ~ 65Source
OPERATION RANGE (LEAVING WATER TEMPERATURE) — DHW (Min. ~ Max.) (℃)
15 ~ 80Source
OPERATION RANGE (OUTDOOR AIR TEMPERATURE) — Cooling (Min. ~ Max.) (℃)
5 ~ 48Source
OPERATION RANGE (OUTDOOR AIR TEMPERATURE) — Heating & DHW (Min. ~ Max.) (℃)
-25 ~ 35Source
Manufacturer wording (2)

The same facts in the manufacturer’s combined or original wording, each with its source.

Manufacturer operating ranges and conditions
5 ~ 27; 15 ~ 65; 15 ~ 80; 5 ~ 48; -25 ~ 35

Each declaration has its own manufacturer operating point, component, measurement method or electrical basis. They are not equivalent unqualified figures. OPERATION RANGE (LEAVING WATER TEMPERATURE) — Cooling (Min. ~ Max.) (℃): 5 ~ 27; OPERATION RANGE (LEAVING WATER TEMPERATURE) — Heating (Min. ~ Max.) (℃): 15 ~ 65; OPERATION RANGE (LEAVING WATER TEMPERATURE) — DHW (Min. ~ Max.) (℃): 15 ~ 80; OPERATION RANGE (OUTDOOR AIR TEMPERATURE) — Cooling (Min. ~ Max.) (℃): 5 ~ 48; OPERATION RANGE (OUTDOOR AIR TEMPERATURE) — Heating & DHW (Min. ~ Max.) (℃): -25 ~ 35. Heating/cooling output is separate from electrical consumption and supply. Sound power and sound pressure remain separately labelled in the original rows. No COP/SCOP/EER/SEER conversion, seasonal average or ranking is calculated.

Source
Manufacturer sound declarations and measurement methods
60 / 56; 52 / 48; 38 / 34

Each declaration has its own manufacturer operating point, component, measurement method or electrical basis. They are not equivalent unqualified figures. SOUND POWER LEVEL — Rated / low noise mode (dB(A)): 60 / 56; SOUND PRESSURE LEVEL AT 1M (CONVERT USING SWL) — Rated / low noise mode (dB(A)): 52 / 48; SOUND PRESSURE LEVEL AT 5M (CONVERT USING SWL) — Rated / low noise mode (dB(A)): 38 / 34. Heating/cooling output is separate from electrical consumption and supply. Sound power and sound pressure remain separately labelled in the original rows. No COP/SCOP/EER/SEER conversion, seasonal average or ranking is calculated.

Source
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