Five common misconceptions about Heat Interface Units (HIUs)
Five common misconceptions about Heat Interface Units (HIUs)
HIU’s perform an important role in heating systems, so it’s important to know right from wrong when it comes to misconceptions in the industry. Let’s set the record straight:
“A HIU is like a boiler”
A heat interface unit (HIU) is an appliance that might look like a boiler, but it functions very differently to deliver heating and domestic hot water (DHW). HIUs transfers the heat from a primary system (usually a communal or district heat network)s into a secondary system (typically a single dwelling or apartment’s heating and hot water circuit) . It makes heat available instantly, whenever it's required by an end user.
Whereas a traditional boiler will use a flame from gas to heat water , a HIU will use the heat generated in the heat network as a heat source.
“One size fits all”
Heating systems come in all shapes and sizes, which means HIUs also have to show the same level of variation. HIUs aren't a universal solution. Different building sizes, types (residential vs commercial) and heating demands require specific HIU capacities and functionalities. Thankfully, there are lots of HIU options available to meet the needs of your heating system and building type.
If you’re not sure which HIU is right for your system, contact the experts at Altecnic who will happily help you. Alternatively, you can request a copy of our Heat Network Design Guide, which provides guidance on current regulations and best practice when selecting a HIU for a project.
“HIUs are outdated”
Not everyone may realise the levels of technology and options that are now available in modern HIUs. Electronic HIUs for example can now offer features like variable flow control and temperature regulation, allowing for better comfort and energy efficiency.
Modern HIUs are sophisticated pieces of equipment with variable-speed pumps and precise controls, ensuring efficient heating delivery. Some electronic HIUs feature a Modbus output capability, meaning when connected the network operator can configure the HIU’s to match the individual demands of the network or even the individual apartments. The units can then be remotely commissioned, improving the efficiency of the site commissioning process - they certainly aren’t outdated.
“The BESA standard is universal”
At the time of publishing this blog, the BESA test standard in the UK only applies to a specific type of HIU (Indirect HIUs). Therefore, it's currently not a universal benchmark for all HIUs. Consulting with HIU manufacturers is recommended for proper unit selection.
As test standards don’t currently reflect the variety of HIUs available on the market, this can make comparing and choosing the right HIU more challenging. The experts at Altecnic can help if you’re having trouble making a decision.
“HIUs create more maintenance issues”
HIU’s are designed to be as low maintenance as possible. With built-in features such as anti-seizure pump cycling, electronic valves which cycle every 24 hours and an anti-scale plate heat exchanger. These all amount to a low maintenance regime compared to comparable products such as gas boilers.
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Related CPDs:
- CPD 3: System Design For Efficiency for Using Electronic Intelligent HIUs
- CPD 4: Drivers for Change and Understanding the BESA HIU Test Regime
We hope we have clarified questions and information surrounding HIUs, but if you are left with any more questions, reach out to the experts at Altecnic who will happily guide you through your options.