Megaflo Unvented Cylinders Explained: Your Guide to High-Pressure Hot Water in Horsham & Adur

Megaflo Unvented Cylinders: High-Pressure Hot Water Systems for Horsham, Lancing & West Sussex Homes.

Hello, I’m Andrew Tyler, your local Gas Engineer and the owner of Prime Boiler Care here in Horsham. 

I spend my days working across the Horsham and Adur Districts, from Southwater and Billingshurst to Steyning, Shoreham-by-Sea, Lancing, and Southwick, helping homeowners get the best from their heating and hot water.

One of the best ways to upgrade your home’s hot water is by installing an unvented cylinder, and the most recognisable brand is the Megaflo. 

If you're looking for an unvented hot water cylinder installation in Horsham or need a Megaflo repair in Storrington or Henfield, understanding what this system is and how it works is key.

What is a Megaflo Unvented Cylinder?

Simply put, a Megaflo is a premium brand of unvented hot water cylinder manufactured by Heatrae Sadia, built from durable duplex stainless steel.

The main difference between this and older, traditional copper vented cylinders is that an unvented cylinder is sealed to the atmosphere. 

The water inside is stored under pressure, typically around 3 bar, which is directly created by your home’s mains incoming water supply.

Crucially, the cylinder doesn't generate pressure; it simply uses the high mains pressure to supply all your hot water outlets. 

This means you get excellent, high-pressure hot and cold water at all your taps and, most notably, in your shower—often eliminating the need for separate booster pumps, making it an ideal choice for better showers in Pulborough or Sompting homes.

Like any system, the heat can come from a gas boiler (perfect for a new boiler installation in West Sussex), electric immersion heaters, or a combination of sources.

Why Choose an Unvented System? 

(The Benefits)

For homeowners across our area, the benefits of an unvented cylinder like the Megaflo are significant:

• Superior Showers and Baths: The high mains pressure provides powerful, consistent flow, giving you the kind of luxury showering you usually only see in hotels. This is a massive plus for multi-bathroom homes in Horsham.

• Clear Loft Space: Unvented systems don't require a cold water storage tank in the loft, freeing up valuable space and simplifying pipework.

• Corrosion Resistance: Megaflo's duplex stainless steel construction provides superior resistance to corrosion, especially important if you live in an area with aggressive water quality. 

    They are rigorously tested to 15 bar—five times the normal operating pressure.

• Fast Recovery: Megaflo cylinders offer very fast heat recovery times, meaning you won’t run out of hot water easily, even in a busy family home.

Why You Need a G3 Qualified Gas Engineer for Installation.

This is where safety and professional expertise become non-negotiable.

Unvented cylinders must be installed by a competent and qualified G3 engineer. 

This is a legal requirement under UK Building Regulations. 

Due to the fact that the water is stored under pressure, there is an inherent danger of overheating and over-pressurisation if safety controls fail.

When water is heated under pressure, its boiling point is raised. 

If the safety mechanisms (like the thermostat, energy cut-out device, and temperature/pressure relief valve) malfunction, the pressure and temperature can rise to dangerously high levels, posing a serious safety risk.

As a certified G3 engineer at Prime Boiler Care, I ensure every unvented cylinder repair in Shoreham-by-Sea or new Megaflo installation in Billingshurst is fitted with the mandatory, three-tiered safety protection, including:

1. A Control Thermostat (60-65°C).

2. An Energy Cut-Out Device (85-89°C).

3. A Temperature and Pressure Relief Valve (set to 90°C + 5°C).

We handle the entire process, including the legal certification and registration of the installation with the local authority—giving you complete peace of mind.

Checking Your Mains Water Supply.

A high-performing unvented cylinder needs a good mains water supply to match. 

The system is dependent on a combination of excellent mains water pressure and flow rate. 

I always check both of these factors—pressure and flow—before advising on any new installation, especially for large homes in Steyning or Storrington with multiple bathrooms. 

Correct design is critical to meeting your expectations for high-performance hot water.

Need High-Pressure Hot Water? 

Get a Megaflo Quote Today!

Whether you’re in Horsham, Lancing, Henfield, or any of the surrounding areas in West Sussex, Prime Boiler Care offers expert service for all your unvented cylinder needs, from new installations to servicing and repairs.

I’m Andrew Tyler, and I pride myself on providing safe, efficient, and reliable gas engineering services right here in your local community.

Call Prime Boiler Care today for a survey, quote, or to book your annual unvented cylinder service.

Call to Action & Contact Details:

Contact Andrew Tyler at Prime Boiler Care:

• Telephone: 01403 814602

• Address: Suite 54, Standby Business Centre, Foundry Lane, Horsham, West Sussex, RH13 5PX

• Service Areas: Horsham, Southwater, Storrington, Billingshurst, Steyning, Henfield, Pulborough, Shoreham-by-Sea, Lancing, Southwick, Sompting, and neighbouring areas.