Head to head
Heatrae Sadia Megaflo Eco 170 vs NIBE S2125 Model 8
The Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres. The NIBE S2125 Model 8 is a air/water heat pump, up to 5.4 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Heatrae Sadia Megaflo Eco 170 | NIBE S2125 Model 8 | |
|---|---|---|
| Dimensions | 1384 x 579 x 600 mm (H x W x D) | 1070 x 1130 x 820 mm (H x W x D) |
| Capacity | 170 litres | - |
| Heat-up time | 22 minutes (15 L/min recovery, 15C to 60C) | - |
| Max inlet pressure | 1.6 MPa (16 bar) | - |
| Immersion heater | 3kW incoloy immersion, back-up | - |
| Warranty | Lifetime guarantee in domestic installations | - |
| 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) |
| Weight | - | 150 kg |
| Max flow temperature | - | up to 75C |
Sources: Heatrae Sadia Megaflo Eco 170, NIBE S2125 Model 8. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Megaflo Eco 170 if...
A 170 litre indirect unvented cylinder from Heatrae Sadia's Megaflo Eco range, one of the most fitted cylinder brands in the UK. It reheats in about 22 minutes at a 15 litre/min flow rate and carries a lifetime guarantee in a domestic installation.
Full Megaflo Eco 170 specifications →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 →Common questions
What is the difference between the Heatrae Sadia Megaflo Eco 170 and the NIBE S2125 Model 8?
The Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres; the NIBE S2125 Model 8 is a air/water heat pump, up to 5.4 kW heat output.
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