Head to head
NIBE S2125 Model 12 vs Telford Tempest 170 Direct
The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kw heat output. The Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres.
Last reviewed 13 September 2026
Specifications side by side
| NIBE S2125 Model 12 | Telford Tempest 170 Direct | |
|---|---|---|
| Dimensions | 1070 x 1130 x 820 mm (H x W x D) | 1200 mm high x 510 mm diameter (approx.) |
| Weight | 160 kg | 40 kg empty, 208 kg full |
| Heat output | 6.80-7.60 kW (average climate), 8.4 kW (cold climate) | - |
| SCOP | 5.0 at 35C, 3.8 at 55C (average climate); 4.2 at 35C, 3.4 at 55C (cold climate) | - |
| Sound power | 49 dB(A) at nominal rating (EN12102) | - |
| Max flow temperature | up to 75C | - |
| Capacity | - | 170 litres |
| Immersion heater | - | 2 x 3kW, 240V single phase |
| Max inlet pressure | - | 3 bar (inlet control group) |
| Warranty | - | Lifetime guarantee on the cylinder (25 years internal), 2 years on components |
Sources: NIBE S2125 Model 12, Telford Tempest 170 Direct. Figures vary by model year and options, so check with the supplier before you commit.
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 →Buy or hire the Tempest 170 Direct if...
A 170 litre direct unvented cylinder from Telford's Tempest range, built in duplex stainless steel with twin 3kW immersions rather than a boiler coil. It suits an all-electric property, and the cylinder body carries a lifetime guarantee when serviced annually.
Full Tempest 170 Direct specifications →Common questions
What is the difference between the NIBE S2125 Model 12 and the Telford Tempest 170 Direct?
The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kW heat output; the Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres.
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