Head to head
LG Therma V Monobloc S 5.50kW vs NIBE S2125 Model 12
The LG Therma V Monobloc S 5.50kW is a r32 monobloc air source heat pump, 5.50 kw heat output. The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| LG Therma V Monobloc S 5.50kW | NIBE S2125 Model 12 | |
|---|---|---|
| Heat output | 5.50 kW at 7C/35C flow | 6.80-7.60 kW (average climate), 8.4 kW (cold climate) |
| SCOP | 4.46 (average climate, 35C flow) | 5.0 at 35C, 3.8 at 55C (average climate); 4.2 at 35C, 3.4 at 55C (cold climate) |
| Sound power | 57 dB(A) rated, 54 dB(A) low noise mode | 49 dB(A) at nominal rating (EN12102) |
| Dimensions | 1239 x 834 x 330 mm (H x W x D) | 1070 x 1130 x 820 mm (H x W x D) |
| Weight | 89.5 kg | 160 kg |
| Max flow temperature | 65C | up to 75C |
| Refrigerant | R32, GWP 675 | - |
Sources: LG Therma V Monobloc S 5.50kW, NIBE S2125 Model 12. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Therma V Monobloc S 5.50kW if...
An LG Therma V Monobloc S rated at 5.50kW, using R32 refrigerant and reaching a 65C flow. A low noise mode drops the sound power to 54 dB(A), useful where the outdoor unit sits close to a boundary or window.
Full Therma V Monobloc S 5.50kW specifications →Buy or hire the S2125 Model 12 if...
The larger NIBE S2125, sized for a medium house and rated to hold output down to -25C outdoor temperature. It shares its cabinet size with the smaller model but weighs 10 kg more for the larger compressor.
Full S2125 Model 12 specifications →Common questions
What is the difference between the LG Therma V Monobloc S 5.50kW and the NIBE S2125 Model 12?
The LG Therma V Monobloc S 5.50kW is a r32 monobloc air source heat pump, 5.50 kW heat output; the NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kW heat output.
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