Safe. Easy to install. Energy efficient.

In response to increasing customer demand, we have recently launched a new Heat Interface Unit, the Hi-Max Instant ID. The Hi-Max Instant ID is designed to provide both central heating and domestic hot water to dwellings which are served by either a district heating scheme or a centralised boiler system.

Comprising two plate heat exchangers - one for the hot water, and one for the apartment heating system - the Hi-Max Instant ID is designed to ensure that the primary return temperatures going back to the district heating system are low, helping the central zero or low carbon technology to operate highly efficiently.

Lightweight and compact design

Lightweight and compact design

Easy access to inspect and maintain

Easy access to inspect and maintain

  • Compact design, can fit in a standard kitchen cupboard
  • No need for boiler flues and no annual gas safe service required
  • Suitable for single and dual zone heating systems
  • Fully modulating pressure independent flow control technology for automatic balancing and fine temperature control
  • Pulsed bypass pre-heat function to improve the response time to demand
  • Scale reducing feature taking heat away from the hot water plate heat exchanger when there is no hot water demand
  • DHW and central heating plate heat exchangers provide a pressure break to both systems
  • 8 Litre central heating expansion vessel 
  • Access to all components for ease of maintenance
  • Plug and play approach to commissioning
  • Provision for a heat meter of your choice - spool piece fitted - 3/4" BSP x 110mm
  • Automatic fault diagnostics

  • Hi-Max instant
Hi-Max instant

View product specification

When clicked this will open the product specification in PDF format.


Order Code 

Heatrae Sadia Hi-Max Instant ID-5/60 HIU 


Heatrae Sadia Hi-Max Instant ID-5/80 HIU


Heatrae Sadia Hi-Max Instant ID HIU Casing


Heatrae Sadia Hi-Max Instant ID HIU Standard First Fix Rail


Heatrae Sadia Hi-Max Instant ID HIU Basic Stand-off Kit


There are currently no BIM files for this product

Approved and accredited
Related information
how to buy
How to buy
At Heatrae Sadia we understand that you should never put a price on comfort. Our products are designed with the highest quality of materials and we lead the market with our engineering expertise. Whilst we don't sell our products direct to the trade, we are the only leading manufacturer to have our entire product range stocked by all the leading merchants.
How to buy this product
customer support
Customer support
If you want more information on how to order; book a service or repair for your product; register your warranty; or to call our UK based helpline, you've come to the right place. Just give us a call and see how our award-winning Customer Support team can help you.
Get help for your product
warranty registation
Warranty registration
We're confident that the quality and reliability of our products is second to none; every one of our products is fully factory tested and any new products in development have extensive field trial testing before we launch them. Remember, your product only has a free period of cover if it is registered so get that peace of mind by registering your warranty online today.
Register your warranty

Related products
Our factory compliance standards

Engineered in Britain.

Trusted worldwide.