Heatrae Megaflo Eco 300DDD 300 Litre Unvented Direct Cylinder

Item code
Lead time
2-3 working days
Delivery cost


Show VAT?

£1,238.51 Excl VAT £1,486.21 Inc VAT

Product details

Megaflo 300DDD Direct Unvented Cylinder

The Megaflo Eco 300DDD Unvented Cylinder works as part of an Direct system to store up to 300 litres of hot water. It is ideally suited for 4-5 bedroom properties with 3 baths and showers.

As an unvented cylinder it provides a powerful hot water performance by using your properties mains water pressure.

Made from stainless steel, the HeatRae Megaflo Eco 300 litre model is built to last and even comes with a fabulous life time warranty.

With fantastic levels of heat and water retention, the HeatRae Megaflo Eco 300DDD model has been built with efficiency in mind and is able to handle up to 15 bars of pressure, up to 5 times more than standard operating pressure levels.


  • Height: 2053mm
  • Diameter: 579mm


  • Capacity: 300 litres
  • Element rating at 240V: 3x3
  • Coil rating: N/A
  • Weight (when empty): 58kg
  • Weight (when full): 358kg

Key features of MegaFlo Eco 300DDD

  • Resistant duplex stainless steel casing - can handle pressures up to 15 bar
  • Coil-in-coil' heat exchanger
  • Insulated outer casing - increased heating efficiency & pressure relief
  • Unique floating baffle system allows water expansion
  • No anode - Removes need to replace or maintain
  • Easy to install
  • Immersion heater design increases levels of hot water
  • Titanium immersion heater
  • Reduction in levels of cold water mixing with hot water
  • Enjoy flowrates up to 20% higher than usual due to the Water inlet controls
  • Improved performance at low pressures down to 1 bar
  • Lifetime manufacturer warranty.
  • Manufactured in UK.

Whats in the Box:

  • 1 x Megaflo Eco 300DD Direct Unvented Cylinder
  • Factory fitted immersion heater and thermal controls
  • Titanium elements
  • Cold water inlet control kit: 0.3MPa (3 bar) pressure reducing valve, 0.8MPa (8 bar) pressure relief valve (BS EN 1567, BS EN 1491 EN 13959) 1/4 turn isolating valve, line strainer, non-return valve, drain valve with hose connection, required nuts and olives
  • Factory fitted temperature and pressure relief valve set at 90 degrees / 1 MPa (10 bars) (BS EN 1490)
  • T&P valve insulation kit
  • 15/22mm Tundish
Order your HeatRae Megaflo Eco 300DDD cylinder from Direct Heating Supplies for speedy delivery and a fantastic low price.

Direct Cylinders

Note: This model is a Direct Cylinder and most commonly used to heat hot water only via electric immersion without the need of a separate boiler.

We strongly recommend that customers looking to purchase a hot water cylinder double check with their installer first to ensure it is the correct version needed for the installation. The return incorrectly purchased hot water cylinders may involve a restocking fee and expensive carriage charges - for further information or advice please contact us.


Show VAT?

£1,238.51 Excl VAT £1,486.21 Inc VAT



  • Lead Time
    2-3 working days
  • Height (mm)
  • Width (mm)
  • Depth
  • Warranty
  • Water supply
  • Heating type
  • Capacity (litres)
  • Immersion
    3 x 3kw
  • Manufacturer Part No:
  • GTIN