Head to head
Heatrae Sadia Megaflo Eco 170 vs Vaillant aroTHERM plus 5kW
The Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres. The Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Heatrae Sadia Megaflo Eco 170 | Vaillant aroTHERM plus 5kW | |
|---|---|---|
| Dimensions | 1384 x 579 x 600 mm (H x W x D) | 965 x 1100 x 450 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 kW |
| SCOP | - | up to 5.03 |
| Refrigerant | - | R290 (propane), low GWP |
| Sound power | - | 53 dB(A) at A7/W35, 58 dB(A) at A7/W55 |
| Weight | - | 128 kg (operating) |
| Max flow temperature | - | 75C |
Sources: Heatrae Sadia Megaflo Eco 170, Vaillant aroTHERM plus 5kW. 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 aroTHERM plus 5kW if...
The smallest aroTHERM plus, sized for a well-insulated flat or small house. It uses the natural refrigerant R290 rather than an F-gas, and reaches a 75C flow temperature, which helps it work with existing radiators on a retrofit job.
Full aroTHERM plus 5kW specifications →Common questions
What is the difference between the Heatrae Sadia Megaflo Eco 170 and the Vaillant aroTHERM plus 5kW?
The Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres; the Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kW heat output.
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