The Megaflo Main 150 Litre Direct Unvented Hot Water Cylinder (7912284) is a UK-manufactured stainless steel cylinder designed to provide reliable mains-pressure hot water for smaller domestic properties. With a 150 litre capacity and two factory-fitted Incoloy 800 immersion heaters, it is well suited to small to medium homes, flats, solar PV installations and properties using off-peak electricity tariffs.
Megaflo Main is the new name for the Main unvented cylinder range. This model replaces the Main 150 Litre Direct Unvented Hot Water Cylinder (720636001).
150 Litre Capacity 2 × 3.0kW Immersion Heaters Direct Unvented 25-Year Inner Vessel Warranty
Capacity
150 Litres
Direct-fed unvented hot water
Immersion Heating
2 × 3.0kW
Incoloy 800 @ 240V
Operating Pressure
3.5 bar
Mains-pressure hot water system
Standing Heat Loss
1.70 kWh/24h
50mm polyurethane insulation
Applications & suitability
Small to Medium Homes
The 150 litre capacity provides a practical stored hot water solution for smaller and medium-sized domestic properties.
Flats & Apartments
A compact 150 litre storage capacity makes this cylinder suitable for flats and apartments requiring mains-pressure hot water.
Solar PV Systems
Suitable for installations using solar PV-generated electricity to heat stored domestic hot water.
Off-Peak Electricity
The direct immersion heating arrangement allows the cylinder to be used with off-peak electricity tariffs.
Key specifications
| Product Code |
7912284 |
| Type |
Direct Unvented |
| Nominal Capacity |
150 Litres |
| Height (A) |
1114 mm |
| Diameter |
Ø 550 mm cylinder / 595 mm base |
| Weight (Empty) |
30 kg |
| Immersion Rating |
2 × 3.0 kW @ 240V |
| Heat-Up Time |
152 mins |
| Standing Heat Loss |
1.70 kWh/24h |
| ErP Energy Rating |
C |
| Operating Pressure |
3.5 bar |
| Maximum Flow Rate |
Up to 55 l/min @ 6 bar |
| Inner Vessel |
High-grade stainless steel, 15 bar pressure tested |
| Insulation |
50mm CFC/HCFC-free polyurethane foam |
| Thermostat |
Adjustable 10–70°C with 80°C high-limit cut-out |
| Expansion Vessel |
12 litre, supplied |
| Connections |
22mm compression / ¾" BSP |
| Immersion Heater Material |
Incoloy 800 alloy |
| Approvals |
KIWA approved, Building Regulation G3 compliant, CE marked |
| Manufactured |
UK by Baxi |
| Warranty |
25 years on stainless steel inner vessel; 1 year parts & labour |
Installation & compatibility
Factory-supplied components: The cylinder is supplied with a 12 litre expansion vessel, T&P relief valve, pressure reducing valve and factory-fitted controls. Connections are provided as 22mm compression / ¾" BSP. The unit is KIWA approved and compliant with Building Regulation G3 requirements.
Design & performance benefits
Mains-Pressure Hot Water
Direct unvented operation provides stored hot water supplied from the mains-pressure system.
Dual Immersion Heating
Two 3.0kW Incoloy 800 immersion heaters provide direct electrical heating for the 150 litre cylinder.
50mm Insulation
Factory-injected 50mm CFC/HCFC-free polyurethane foam helps minimise standing heat loss.
Compact Capacity
The 150 litre capacity provides a practical stored hot water solution for smaller domestic installations.
Additional installation features
12 Litre Expansion Vessel
Supplied with a 12 litre expansion vessel as part of the unvented cylinder package.
Factory-Fitted Controls
Supplied with factory-fitted controls, pressure reducing valve and T&P relief valve.
Adjustable Thermostat
Temperature can be adjusted from 10–70°C with an 80°C high-limit cut-out.
Ideal for
The Megaflo Main 150 Litre Direct Unvented Hot Water Cylinder is ideal for small to medium homes, flats, apartments, solar PV systems and properties using off-peak electricity tariffs. It can also be paired with the Main Eco Compact System or Main Eco Elite System boilers as part of a complete domestic hot water solution.
Manufactured in the UK by Baxi, this 150 litre unvented cylinder combines high-grade stainless steel construction, direct immersion heating, 50mm polyurethane insulation and factory-supplied controls. It is KIWA approved, G3 compliant and backed by a 25-year stainless steel inner vessel warranty plus a one-year parts and labour warranty.
At GetPlumb, we strive to provide reliable and cost-effective delivery options to our customers. Please review our shipping policy below.
🆓 Free Local Delivery (Orders £100 & above)
We offer FREE delivery on orders £100 or more
for selected local areas.
Eligible Postcodes Include:
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For orders that do not qualify for free delivery, standard
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This rate applies only to Harvey’s block salt products.
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Examples:
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For oversized items where the product length is 1.5 metres or more:
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Collection from Store
Customers can also choose to collect their order from our store in
Reading, UK, at no additional charge. For any questions regarding shipping, please contact our support team at online@getplumb.co.uk.
