Legacy products and support

Heat Interface Units

A unique range of HIUs, including both standard and custom models, known to be consistently the most efficient on the market – as independently tested

High efficiency hydraulic [heat] interface units (HIUs) for the supply and control of heating and hot water to domestic and commercial properties connected to a district heating system.

The most efficient heat interface units in the UK

HIU performance has a major impact on the operating efficiency of a heat network. We are proud that independent BESA testing has confirmed what we already knew – our products are the most efficient in the industry.

And the good thing is you never need to take our word for it, with the independent test results providing performance data under standard conditions, while the continuous stream of data coming from HIUs in the field allows us to demonstrate real world performance like nobody else can, or dare – we couldn’t hide a problem (if there was one) if we tried.

Pioneering HIU design

Heatweb manufactured the very first electronic HIUs in the 90s. We continue to drive the industry forward through continuous product development and many unique, patent-protected features.

We have unmatched experience and understanding of heat network design, based upon many thousands of successful installations throughout the UK, and can provide more accurate and efficient utilisation of thermal energy in district heating environments.

And this is recognised – we have contributed to every piece of heat network related guidance there is since 2000, spanning both Institutes, also sitting on the Government’s RHI, MMSP, and SAP technical advisory groups.

(Note: DHW Outputs based on 70°C Primary Flow & 10-50°C Secondary Temperatures – CH Outputs based on 70°C Primary Flow & 65-35°C Secondary Temperatures)

Talk to the experts – call 0345 241 1441 or email enquiries@heatweb.co.uk

Amazon District Indirect Storage HIU

The Amazon District range of cylinders are designed for the provision of domestic hot water on communal heating systems. The Indirect version also…

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Amazon HXIN Unvented DHW Cylinder

The HXINUV plate heat exchanger assembly as fitted to unvented hot water cylinders Telford Tempest enables faster heat up and recovery times than possible…

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Cost Analysis on the DATA HIU

And it is also one of the most competitive HIUs on the market, BUT it's never the cheapest, so justifying why it's important to maintain quality equipment…

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DATA Available options

The unit has several options available depending on requirements. The basic unit can be equipped with any combination of the

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DATA Dashboard

A DATA HIU connected to a small biomass heat network. Data updates every 30 seconds, and certain features are interactive, such as the graphs, and links…

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DATA Dimensions

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DATA EC Declaration

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DATA Extra Technical data

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Data Monitor v1

The DATA Monitor system is a Linux based controller that bridges between HIUs and Ethernet or

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Data Protection

Something we are wrestling more and more with is data

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DATA SPLIT EC Declaration

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DATA SPLIT Technical data

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DATA Technical data

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Flows ihiu slimextra

For monitoring the SLIM EXTRA electronic HIUs, connecting them to a range of MQTT servers and heatweb.info, and providing additional central heating…

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Grundfos Digital Sensors

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Install Schematic: Data Extra HIU

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Installation Instructions for the Data Extra HIU

The DATA Extra HIU enables us to take the functions of our flagship twin plate DATA/heat-interface-units/the-data/the-data-hiu/ HIU and increase the…

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Installation Instructions for the Data HIU

The unit has several options available depending on requirements. The basic unit can be equipped with any combination of the

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Installation Instructions for the Data Split HIU

The DATA SPLIT Hydraulic Interface Unit HIU combines the power and control of the DATA HIU, with some useful practical

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Installation Instructions for the SLIM Extra HIU

The SLIM Extra combines the power and control of the SLIM HIU, for the DHW circuit, with the addition of direct heating flow and return connections. The…

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Installation Instructions for the SLIM HIU

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Open Digital Solutions for Net Zero Energy

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Schematic: Data Extra HIU

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Schematic: Data HIU

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Schematic: Data SPLIT HIU

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Schematic: SLIM Extra HIU

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SLIM EC Declaration

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SLIM Twin

The SLIM Twin DHW HIU is based on the standard SLIM DHW HIU however as the name suggests there are two SLIM HIU's working together to give a maximum…

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Specials

We can design and modify a unit to fulfil your needs with high quality proven components, resulting in reliable HIU's.

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SPLIT security case

The Split Security Case, is an attractive, sleek, steel case painted white for a more appealing

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Table: DATA

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Table: DATA Advanced Troubleshooting

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Table: DATA End User Troubleshooting

Always take in account the safety of yourself and others when performing a

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Table: DATA Extra Advanced Troubleshooting

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Table: DATA Variables

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Table: SLIM Extra Advanced Troubleshooting

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The Amazon HX-DATA Storage HIU System

The Amazon HX-DATA is a combined HIU Heat Interface Unit and Unvented Storage system, designed to provide exceptional domestic hot water performance on…

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The Amazon HX-HIU

The Amazon HX-HIU combines a single or twin plate HIU's with an Amazon unvented hot water storage cylinder sized to your specific needs.

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The DATA Extra HIU

Learn more about The Data Extra a commercial heat exchanger for indirect heating & hot water systems. Order online.

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The DATA Extra HIU

The DATA Extra HIU enables us to take the functions of our flagship twin plate DATA/heat-interface-units/the-data/the-data-hiu/ HIU and increase the…

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The DATA HIU

The DATA is a twin plate hydraulic interface unit for hot water and indirect central heating. Discontinued; serviced and supported by Heatweb.

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The DATA HIU

The article forms the basis of the literature on the DATA and DATA PLUS

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The DATA Installation Instructions

No longer in use...Go to

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The DATA Mitigating Risk

The components and methods used in the construction are identical to its sister unit the DIGI. The only substantial difference is the use of a second…

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The DATA MIX HIU

The DATA MIX is based on on the DATA SPLIT HIU, but has the CH plate heat exchanger replaced with a mixing manifold. This gives the HIU the unique ability…

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The DATA Plus HIU

Learn more about The Data Plus domestic hot water heat exchanger for use with indirect hot water system boilers. Order online today.

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The DATA Specification Text

The following specification text can be used as guidance when writing a District heating design

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The DATA SPLIT HIU

Learn more about The Data Split a water heating unit for unvented indirect hot water systems & central heating. Order online.

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The DATA SPLIT HIU

At every step of the way, a district heating system needs to fulfil the wants and needs of all interested parties. An energy efficient system is…

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The DIGI Camper

The Camper is so named because it was originally designed for fitting external to holiday homes on a

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The DIGI Compact HIU

Learn more about The Digi a double wall DHW heat exchanger for use with direct central heating. See technical specifications & order online.

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The DIGI Compact HIU

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The DIGI HIU

Single Plate Hydraulic Interface Unit for Domestic Hot Water & Direct Central Heating

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The DIGI HIU

The DIGI HIU uses the latest electronic stepper motor controls to provide both DHW and central heating. Central heating is provided directly, with a…

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The DIGI Specification Text

All apartments should be fitted with a Heat Interface Unit HIU. Each HIU should take its primary heat source from a district heating system, and must be…

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The MIX HIU

Learn more about The Mix single plate HIU, for direct heating of water heaters. View technical specifications & order online

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The SLIM Extra

Single Plate Hydraulic Interface Unit for Domestic Hot Water & Direct Central heating

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The SLIM Extra HIU

The SLIM Extra combines the power and control of the SLIM HIU, for the DHW circuit, with the addition of direct heating flow and return connections. The…

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The SLIM HIU

Learn more about The Slim HIU, providing energy efficient heating for instantaneous domestic hot water needs. Order online.

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The SLIM HIU

The SLIM HIU is possibly the smallest and most efficient DHW generation unit on the market, using the latest electronic stepper motor controls to provide…

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The SLIM Plus HIU

Learn more about The Slim Plus a compact HIU for hot water only domestic water heating. View technical specification & order online.

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The SPLIT H.O. HIU

Learn about The Split H.O. a heat interface unit for heat only boiler unvented heating systems. See technical specifications & order online.

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User Instructions for the Data HIU

Installation\Instructions\for\the\Data\HIUExplanation\of\symbols\and\abbreviations

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Wiring: Data HIU with Ethernet Billing

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Converted from the previous website, last edited 2024-10-30. Under review for the new site.

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