Head to head
NIBE S2125 Model 12 vs Telford Tempest 300 Indirect
The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kw heat output. The Telford Tempest 300 Indirect is a indirect unvented hot water cylinder, 300 litres.
Last reviewed 13 September 2026
Specifications side by side
| NIBE S2125 Model 12 | Telford Tempest 300 Indirect | |
|---|---|---|
| Dimensions | 1070 x 1130 x 820 mm (H x W x D) | 1750 mm high x 580 mm diameter |
| Weight | 160 kg | 61 kg |
| 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 | - | 300 litres |
| Material | - | 2304 duplex stainless steel |
| Relief valve setting | - | 7 bar / 90C |
| Immersion heater | - | 3kW, 240V single phase, included |
| Warranty | - | Lifetime guarantee on the body with annual service, 2 year component guarantee |
Sources: NIBE S2125 Model 12, Telford Tempest 300 Indirect. 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 300 Indirect if...
A 300 litre indirect cylinder for a larger household or a property with high simultaneous hot water demand, part of Telford's Tempest range. Like the smaller direct model it carries a lifetime body guarantee when serviced annually.
Full Tempest 300 Indirect specifications →Common questions
What is the difference between the NIBE S2125 Model 12 and the Telford Tempest 300 Indirect?
The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kW heat output; the Telford Tempest 300 Indirect is a indirect unvented hot water cylinder, 300 litres.
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