Head to head
Baxi 800 Combi 2 36kW vs Heatrae Sadia Megaflo Eco 250
The Baxi 800 Combi 2 36kW is a gas combi boiler, 36 kw hot water output. The Heatrae Sadia Megaflo Eco 250 is a indirect unvented hot water cylinder, 250 litres.
Last reviewed 13 September 2026
Specifications side by side
| Baxi 800 Combi 2 36kW | Heatrae Sadia Megaflo Eco 250 | |
|---|---|---|
| Dimensions | 700 x 390 x 285 mm | 1738 x 579 x 600 mm (H x W x D) |
| Warranty | 10 years | Lifetime guarantee in domestic installations |
| Hot water output | 36 kW | - |
| Central heating output | 26.4 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 93% | - |
| Weight | 29.5 kg | - |
| Hot water flow rate | 15 litres per minute | - |
| 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 |
Sources: Baxi 800 Combi 2 36kW, Heatrae Sadia Megaflo Eco 250. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the 800 Combi 2 36kW if...
A gas combi boiler with 36 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 15 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years. Seasonal efficiency is 93%.
Full 800 Combi 2 36kW specifications →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 →Common questions
What is the difference between the Baxi 800 Combi 2 36kW and the Heatrae Sadia Megaflo Eco 250?
The Baxi 800 Combi 2 36kW is a gas combi boiler, 36 kW hot water output; the Heatrae Sadia Megaflo Eco 250 is a indirect unvented hot water cylinder, 250 litres.
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