Head to head
LG Therma V Monobloc S 5.50kW vs Viessmann Vitodens 100-W 30kW combi
The LG Therma V Monobloc S 5.50kW is a r32 monobloc air source heat pump, 5.50 kw heat output. The Viessmann Vitodens 100-W 30kW combi is a gas combi boiler, 31.7 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| LG Therma V Monobloc S 5.50kW | Viessmann Vitodens 100-W 30kW combi | |
|---|---|---|
| Dimensions | 1239 x 834 x 330 mm (H x W x D) | 700 x 400 x 360 mm |
| Weight | 89.5 kg | 35-38 kg |
| Heat output | 5.50 kW at 7C/35C flow | - |
| SCOP | 4.46 (average climate, 35C flow) | - |
| Refrigerant | R32, GWP 675 | - |
| Sound power | 57 dB(A) rated, 54 dB(A) low noise mode | - |
| Max flow temperature | 65C | - |
| Hot water output | - | 31.7 kW |
| Central heating output | - | 25 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 98% |
| Warranty | - | 5 years |
| Hot water flow rate | - | 15.6 litres per minute |
Sources: LG Therma V Monobloc S 5.50kW, Viessmann Vitodens 100-W 30kW combi. 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 Vitodens 100-W 30kW combi if...
A gas combi boiler with 31.7 kW of hot water output, sized for a three-bed house with one or two bathrooms. It delivers about 15.6 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 5 years. Seasonal efficiency is 98%.
Full Vitodens 100-W 30kW combi specifications →Common questions
What is the difference between the LG Therma V Monobloc S 5.50kW and the Viessmann Vitodens 100-W 30kW combi?
The LG Therma V Monobloc S 5.50kW is a r32 monobloc air source heat pump, 5.50 kW heat output; the Viessmann Vitodens 100-W 30kW combi is a gas combi boiler, 31.7 kW hot water output.
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