Head to head
Heatrae Sadia Megaflo Eco 250 vs NIBE S2125 Model 12
The Heatrae Sadia Megaflo Eco 250 is a indirect unvented hot water cylinder, 250 litres. The NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Heatrae Sadia Megaflo Eco 250 | NIBE S2125 Model 12 | |
|---|---|---|
| Dimensions | 1738 x 579 x 600 mm (H x W x D) | 1070 x 1130 x 820 mm (H x W x D) |
| Capacity | 250 litres | - |
| Heat-up time | 34 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 | - | 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) |
| Weight | - | 160 kg |
| Max flow temperature | - | up to 75C |
Sources: Heatrae Sadia Megaflo Eco 250, NIBE S2125 Model 12. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Megaflo Eco 250 if...
A 250 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 34 minutes at a 15 litre/min flow rate and carries a lifetime guarantee in a domestic installation.
Full Megaflo Eco 250 specifications →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 →Common questions
What is the difference between the Heatrae Sadia Megaflo Eco 250 and the NIBE S2125 Model 12?
The Heatrae Sadia Megaflo Eco 250 is a indirect unvented hot water cylinder, 250 litres; the NIBE S2125 Model 12 is a air/water heat pump, up to 8.4 kW heat output.
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