Head to head
NIBE S2125 Model 8 vs Telford Tempest 170 Direct
The NIBE S2125 Model 8 is a air/water heat pump, up to 5.4 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 8 | 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 | 150 kg | 40 kg empty, 208 kg full |
| Heat output | 5.33 kW (average climate), 5.4 kW (cold climate) | - |
| SCOP | 5.0 at 35C, 3.7 at 55C (average climate); 4.1 at 35C, 3.2 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 8, 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 8 if...
A smaller NIBE S2125 rated to keep working in cold climates, reaching up to 65C flow even at -25C outdoors. It suits a smaller house where cold-weather reliability matters more than raw output.
Full S2125 Model 8 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 8 and the Telford Tempest 170 Direct?
The NIBE S2125 Model 8 is a air/water heat pump, up to 5.4 kW heat output; the Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres.
GetBrent is an independent directory and is not a dealer for, nor affiliated with, either manufacturer. Model and brand names are the trademarks of their owners.