From hydraulic modelling to HIU commissioning. We design, install, and commission district heating distribution networks for residential and mixed-use developments.
Every district heating network follows a clear, auditable sequence. Here is exactly what happens at each stage.
A district heating network distributes heat from a central source to multiple buildings or dwellings via a network of insulated pipes. The central heat source (boiler, heat pump, CHP, or waste heat recovery unit) generates hot water that circulates through pre-insulated underground mains. Each dwelling connects via a heat interface unit (HIU), which transfers heat from the network to the internal system without mixing the network water with domestic hot water. The network operator remains responsible for the plant, the distribution network, and the HIUs at each property. Heat meters are mandatory under the Heat Network Metering and Billing Regulations 2014.
The operating temperature of a district heating network is determined by the heat source and the heat emitters in each dwelling. Conventional high-temperature networks operate at 70 to 90 degrees Celsius, which suits standard radiator systems and is compatible with traditional gas-fired plant. Low-temperature networks and fifth-generation systems operate below 60 degrees Celsius, which is necessary for efficient heat pump operation. The design temperature regime must match the plant operating parameters from the outset. Retrofitting a network to a different temperature regime is costly, so this decision must be made at the hydraulic design stage.
District heating mains are constructed from factory-insulated pipe systems. The carrier pipe is typically carbon steel or HDPE, surrounded by polyurethane foam insulation and protected by an HDPE outer casing. USP works with approved manufacturers including LOGSTOR and Isoplus. Joints are made by welding (steel carrier) or electrofusion (HDPE carrier) and the insulation continuity is maintained using prefabricated insulated joint kits. Pipe sizing is determined by hydraulic modelling to ensure balanced flow and acceptable pressure drop across the network under all load conditions.
Each dwelling or building connects to the district heating network via a heat interface unit (HIU). The HIU contains a plate heat exchanger, flow control valve, circulation pump, and heat meter. It transfers heat from the primary network to the secondary internal system without allowing the network water and the domestic water to mix. USP supplies HIUs from approved manufacturers including Dutypoint, Caleffi, and Danfoss. Each unit is commissioned to the requirements of the CIBSE Code of Practice for Heat Networks, including flow and return temperature verification, pressure checks, and heat meter calibration.
Every district heating network we install is hydraulically balanced, CIBSE inspected, and fully commissioned before handover. These are real USP projects, not stock photos.
The critical parameters that govern every district heating network design and installation.
End-to-end capability from a single approved district heating installer.
Every district heating network we deliver meets the highest industry standards. Worker safety, public safety, environmental responsibility, and project compliance from planning to sign-off.
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I contacted USP and within minutes had a chat with Justin who described exactly how the job would be done and provided a comprehensive quote including labour and materials and was able to start the work in just 7 days. Justin and his team were brilliant and did an amazing job. I can highly recommend USP.
Jack and Joel were absolutely amazing this morning and really put themselves out to dig a hole without having to dig another hole in my drive. More work for them but one happy customer.
From the initial quote through to work completion, Justin and his work partner were a mix of professional, knowledgeable, good-humoured, and clear in all explained (I felt an instant ease to agree to the work). The work itself was excellent and they left the place immaculate!
George and Jack come out today to move a gas meter. It wasn't a straightforward job, but they both took time to talk me through what they were doing and what the next steps are. Very friendly and polite and thought about the needs of our family.
Jack and George are great.
Bang on time, completed the work perfectly, no issues. Left the meter really neatly finished. Jack and Joel were very courteous and did a great job.
George and Jack turned up and did a first class job, very friendly and professional. Great job lads.
Jack and Joel were brilliant. Very polite, worked to my highest expectations. Left the area as clean and tidy, as was possible. And explained every step of the process to me, answering any questions I had.
Fantastic work from Jack and Johl.
Tell us about your project and we will send you a free, no-obligation district heating design plan within 24 hours.
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