Ideal for homes with above average hot water demands, FlowSmart negates the need for a large, permanent store of hot water.

5 year warranty


Features of the FlowSmart
  • 5 year guarantee
  • Ideal for households with above average hot water demands
  • Delivers hot water for long periods
  • High flow rate unaffected by demand
  • Simple installation
  • Space efficient
  • Low voltage PV immersion kit available
  • Uses 25% less gas than conventional system boiler set-ups

Detailed Information

For homes with above average hot water demands, look no further than FlowSmart. FlowSmart at last enables even large households to enjoy the energy efficiency benefits of the combination boiler.

The combination boiler is the best and most energy efficient option for most homes with average hot water demands. They provide hot water only when there is a demand and operate without the need to keep a permanent store of hot water.

But due to limits on the combi boiler’s ability to supply large volumes of hot water to a number of outlets at the same time, the less efficient conventional boiler and hot water cylinder set-up is the usual choice for larger properties.

The Alpha FlowSmart system overcomes these issues and in fact, more than matches the hot water performance of a system boiler and 200 litre unvented cylinder, while using 25% less gas.

The original FlowSmart system incorporates either an E-Tec Plus 33 boiler with separate GasSaver unit, or an InTec 40GS2, with a 50 litre floor-standing thermal store. A combined wall-hung version is also available, with an InTec 40GS2 boiler and ‘bolt-on’ wall-hung thermal store.

Piping Kit with InTec 40GS2
Part Number: 3.022913
Wall-hung FlowSmart
Part Number: 6.2004555
FlowSmart with E-Tec Plus 33 and floorstanding cylinder
Part Number: 6.2003555
FlowSmart with InTec 40GS2 and floorstanding cylinder
Part Number: 6.2005555


How it works


When there is a hot water demand, mains cold water flows into the GasSaver, where it is pre-heated using heat reclaimed from boiler flue gases.


It then passes through the thermalstore's coil heat exchanger where it is heated further by surrounding hot water from the primary system (also known as the central heating system).


The water then passes through a blending valve, where it is controlled to an optimum 3°C before entering the boiler. Energy bills and carbon emissions are significantly reduced.


Due to the mains water being pre-heated, the boiler's workload is significantly reduced.

How the FlowSmart system works


  • FlowSmart (wall-hung) Installation Instructions (1.74mb)
  • FlowSmart (floor-standing) Installation Instructio (1.62mb)
Address Finder
Choose an address from the list below...
Register Interest
Provide your details below and hit 'Register Interest'.

We use cookies to improve your experience, including to personalise content, to provide useful features, and to analyse our traffic and measure performance. By using this site, you agree to our use of cookies.

Cookie Preferences
Essential Cookies
Non-Essential Cookies

About Cookies and your Privacy

When you visit any web site, it may safely store or retrieve information in cookies. This information might be about you, your preferences or your device and is mostly used to make the site work as you expect it to. The information does not usually directly identify you, but it can give you a more personalised and consistent web experience.

We respect your right to privacy, so you can choose not to allow some types of cookies. Click on the different category headings to find out more and change our default settings. However, blocking some types of cookies may impact your experience of the site and the services we are able to offer. Some cookies are essential and the website would not function without them.

Always Active

Essential Cookies

These cookies are essential for the website to function and cannot be switched off in our systems.

These are usually to do with keeping track of information between page views like your privacy preferences or that you have logging in.

You can set your browser to block or alert you about these cookies, but some parts of the site will not then work. 

The essential cookies we set are:

  • PHPSESSID - A unique reference to your browser session on our website. This allows us to keep track of things like your basket and whether you are logged in. This cookie will expire after the browser is closed
  • plii - This cookie ensures you are kept logged in to the website during your session.
  • nfPP-* - These cookies store your preferences regarding cookie preferences, like if you have accepted the notice and if you have optionally disabled non essential cookies. These persist between browser sessions

Non-Essential Cookies

These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. Some information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance and make improvements.

  • Facebook: We use conversion tracking from Facebook to help us understand how effective campaigns are from Facebook.
  • Google AdWords Conversion: We use conversion tracking to help us understand how effective our digital campaigns are.
  • Google Analytics: We use Google Analytics to collect information about how visitors use our website. For example, we collect details of the site where the visitor has come from and the total number of times a visitor has been to our website.
  • Google Tag Manager: We use Google Tag Manager to track user behaviour, traffic analysis and marketing optimisation.
  • LinkedIn: We use conversion tracking from LinkedIn to help us understand how effective campaigns are from LinkedIn.