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Post once — receive competing offers from engineers. Free, no obligation.
HIU Replacement is a service provided by independent engineers and contractors on the HVACX marketplace. HVACX connects you with professionals who can carry out the work — we do not perform services ourselves. You deal directly with the engineer you choose.
HVACX is a marketplace. We connect customers with independent HVAC engineers and contractors across the UK. We do not perform services ourselves — you deal directly with the professional you choose.
HVACX connects you with HIU specialists, heat exchanger engineers, and district heating contractors. All engineers on HVACX are independent — browse reviews, compare quotes, and choose the right engineer for your requirements.

The Manrose MF125S is a high-performance, 125mm mixed-flow inline extractor fan designed to provide robust ventilation in spaces where powerful air movement is required. Engineered for versatility, this compact unit excels in managing airflow within both residential and light commercial settings, including bathrooms, kitchens, and office areas where ducting runs are necessary to move stale air effectively. Its advanced mixed-flow technology balances high-pressure output with energy efficiency, ensuring consistent air extraction even through longer lengths of flexible or rigid ducting. The fan is constructed with durability in mind, featuring a sleek, modular design that simplifies both the installation process and ongoing maintenance. By operating within the ductwork, the MF125S remains largely out of sight, reducing the physical footprint within a room while minimizing internal noise levels. Whether you are addressing humidity buildup in a shower room or requiring improved air circulation in a utility area, this reliable inline fan delivers the necessary power to maintain healthy indoor air quality. Its sturdy build and efficient motor design make it a dependable choice for professionals and homeowners alike who seek a discreet yet highly capable ventilation solution for demanding environments.

The Daikin RYMA12B represents the pinnacle of modern climate control, functioning as a sophisticated outdoor heat pump unit engineered for versatile VRF (Variable Refrigerant Flow) applications. Designed to handle demanding environmental requirements, this unit excels in both residential and light commercial settings, providing reliable, high-performance heating and cooling throughout the year. Its advanced architecture prioritizes energy efficiency, utilizing smart inverter technology to modulate compressor speed and minimize power consumption, resulting in significant operational cost savings. The RYMA12B is built for long-term durability, ensuring quiet operation and consistent thermal comfort even during extreme weather conditions. By intelligently adjusting its output based on real-time demand, the system maintains precise temperature stability across multiple indoor zones, making it an ideal choice for modern open-plan homes, boutique offices, or retail environments where space and comfort are at a premium. With its robust build quality and commitment to environmental sustainability, this Daikin unit integrates seamlessly into complex HVAC configurations, offering professionals a dependable foundation for customized indoor climate management. The system is engineered to simplify installation while maintaining the high standards of performance that the industry expects from Daikin’s specialized heat pump lineup.

The Daikin RYMA10B stands at the forefront of modern climate control, serving as a high-performance heat pump module engineered for demanding VRV/VRF applications. Designed to deliver unparalleled comfort, this robust unit provides precise heating and cooling solutions for large-scale commercial buildings, expansive office complexes, and luxury residential estates. By leveraging advanced inverter technology, the RYMA10B ensures exceptional energy efficiency, significantly reducing operational costs while maintaining consistent indoor environmental quality throughout the changing seasons. Its sophisticated design allows for seamless integration into complex multi-zone HVAC layouts, offering engineers and installers superior flexibility in system architecture. Built for reliability and long-term durability, this system excels in environments requiring intensive duty cycles, such as server rooms or high-traffic commercial spaces. The unit utilizes environmentally conscious refrigerants to meet modern sustainability standards, balancing high cooling capacities with a minimized carbon footprint. With its whisper-quiet operation and intelligent thermal regulation, the Daikin RYMA10B represents an elite choice for projects that prioritize both peak performance and sustainable building management. Its compact footprint ensures it remains an adaptable solution for tight mechanical spaces without compromising the powerful output necessary to manage substantial thermal loads effectively.

The Daikin RYYQ12U is a high-performance VRV IV+ heat pump engineered for demanding commercial and large-scale residential applications. This sophisticated outdoor unit is designed to provide unparalleled climate control, featuring Daikin’s industry-leading continuous heating technology. Unlike conventional systems that suffer from downtime during defrost cycles, the RYYQ12U ensures an uninterrupted, comfortable indoor environment, making it an essential solution for spaces where thermal stability is critical. Built for extreme efficiency, this unit utilizes advanced inverter technology to modulate capacity precisely based on real-time demand, significantly reducing energy consumption and operational costs. Its robust construction allows for flexible installation, while its intelligent management capabilities make it ideal for complex multi-zone office complexes, luxury residences, and retail environments that require reliable heating and cooling year-round. By maintaining consistent comfort levels even in freezing outdoor temperatures, this heat pump provides a seamless transition between seasons. The system’s architecture supports sophisticated integration, ensuring optimized performance across diverse indoor unit configurations. Whether tasked with maintaining comfort in professional offices or high-end living spaces, the Daikin RYYQ12U delivers quiet, sustainable, and powerful climate management, setting a high standard for modern building services engineering.

The Daikin RYYQ10U is a high-performance VRV IV+ heat pump engineered to deliver comprehensive climate control for modern commercial environments. This versatile system serves as an all-in-one thermal management hub, seamlessly integrating heating, cooling, ventilation, and hot water production through a centralized, intelligent interface. By utilizing advanced Variable Refrigerant Temperature (VRT) technology, the unit continuously adjusts its operation based on real-time environmental demands, significantly boosting seasonal efficiency by up to 28% while eliminating uncomfortable cold drafts. A standout feature is its unique continuous heating capability, which ensures steady comfort even during defrost cycles, making it a reliable alternative to traditional boiler-based heating. Designed for flexibility, the RYYQ10U offers extensive piping lengths and elevation capabilities, allowing it to adapt to complex architectural layouts with ease. With full inverter compressor technology and built-in diagnostic tools like automated refrigerant charging, the system simplifies maintenance and reduces long-term operational costs. It is an ideal solution for large office buildings, retail spaces, and hotels where precise zone control and energy conservation are paramount. Furthermore, the system supports proactive cloud-based monitoring, allowing for 24/7 oversight and predictive maintenance to ensure consistent peak performance throughout the system's extended operational lifecycle.

The Daikin RYYQ8U VRV IV+ heat pump stands as a pinnacle of climate control technology, engineered to provide comprehensive thermal management for diverse commercial and large-scale residential applications. This versatile system serves as a unified solution, seamlessly integrating space heating, precision air conditioning, domestic hot water production, and ventilation. At its core, the RYYQ8U features advanced continuous heating technology, which eliminates the traditional cooling cycles common in heat pump operation, ensuring constant, comfortable warmth regardless of external conditions. Driven by intelligent Variable Refrigerant Temperature (VRT) logic, the unit dynamically adjusts its output to match precise real-time demands, drastically reducing energy expenditure by up to 28% compared to standard systems. Its robust design incorporates full inverter-driven compressors, a highly efficient four-side heat exchanger, and sophisticated refrigerant-cooled electronics for long-term reliability. Designed for maximum architectural flexibility, the system supports extensive piping networks and significant height variations, making it an excellent choice for complex multi-zone buildings or renovations. With integrated cloud-based monitoring, facility managers gain proactive insights into system health and performance. The RYYQ8U delivers professional-grade, sustainable performance, maintaining stable indoor environments while minimizing operating costs through superior energy efficiency and intelligent, weather-responsive operation.
A diagnostic callout typically costs £80–£150. HIU repair costs range from £150–£500. Plate heat exchanger cleaning and servicing costs £200–£600. Post your request on HVACX to receive competing quotes.
Costs vary depending on the scope of work, system type, and complexity. Post your request on HVACX to receive competing quotes from multiple engineers tailored to your specific requirements.
Many engineers on HVACX offer same-day or next-day callouts for urgent work. Indicate your urgency when posting your request — engineers will respond with their earliest availability, typically within 24 hours.
Yes — work on gas, refrigerant, and electrical systems must be carried out by appropriately certified engineers (Gas Safe registered, F-gas certified, or qualified electricians). HVACX connects you with certified professionals — always verify their qualifications before proceeding.
HVACX engineers cover the entire United Kingdom. Post your request with your postcode and we will match you with engineers who service your area.
No. HVACX is a marketplace that connects customers with independent engineers and contractors. We do not perform any work ourselves. You deal directly with the professional you choose.
Looking for HIU Engineer? HVACX connects you with rated engineers across the UK who can help. Post y…
Learn moreLooking for HIU Repair? HVACX connects you with rated engineers across the UK who can help. Post you…
Learn moreLooking for HIU Service? HVACX connects you with rated engineers across the UK who can help. Post yo…
Learn moreLooking for HIU Maintenance? HVACX connects you with rated engineers across the UK who can help. Pos…
Learn moreHVACX engineers cover the entire United Kingdom. Post your request with your postcode and we will match you with engineers who service your area.
Post your hiu replacement request and receive competing quotes from rated engineers in your area — free, with no obligation.