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Hawthorn Primary School in Cantley, Doncaster, replaced an ageing boiler arrangement with a hybrid system combining air-source heat pumps and condensing gas boilers. Ideal Commercial Heating’s case study says the design was intended to provide more reliable comfort across buildings of different ages and construction, particularly in cold weather, while retaining much of the school’s existing heat distribution.
The reports describe the equipment, controls and retrofit decisions, but they do not publish measured before-and-after temperatures, energy bills, carbon emissions or comfort-survey results. The project should therefore be read as a documented installation and design approach—not proof of a quantified saving.
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The school occupies several buildings with varying age and construction. According to Ideal Commercial Heating’s case study, maintaining reliable comfort and consistent internal temperatures had been difficult, especially during colder periods.
The previous plant was described as two outdated open-flued boilers with forced-draft burners and undersized pipework. The manufacturer’s account attributes poor efficiency, high gas use and unreliable comfort to that old arrangement and to the mixed building fabric. Those are case-study descriptions rather than findings from an independently published energy audit, so they should not be treated as measured baseline figures.
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For a primary school, the practical issue is not simply replacing a boiler with a newer appliance. Classrooms, halls and ancillary spaces can have different heat losses and operating schedules, while existing radiators and pipework may limit how far flow temperatures can be reduced. Hawthorn’s solution was designed around those constraints.
What equipment was installed?
The installation combines two air-source heat pumps with three high-output condensing boilers. The equipment schedule reported in the manufacturer’s case study and its project PDF is:
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| Component | Quantity | Reported rating or role |
|---|---|---|
| ECOMOD 290HT air-source heat pump | 2 | 50 kW each; outdoor units serving the low-carbon side of the system |
| Evomax 2 condensing boiler | 3 | 150 kW each, installed in cascade; 450 kW combined nominal output |
| Buffer vessels | Not stated | Receive heat from the heat pumps and help separate generation from demand |
| Plate heat exchanger | 1 reported | Separates primary and secondary circuits |
The heat pumps were positioned outside the plant room. The three boilers were mounted on a frame with a header kit and preformed insulation kits. The two heat pumps provide a combined nominal 100 kW, while the boilers provide 450 kW of nominal capacity. Those are product and system ratings, not independently verified output at the school.
How does the hybrid control strategy work?
A building management system (BMS) is reported to select the heat source according to outdoor conditions. In milder weather, the heat pumps are intended to meet much of the school’s heating and hot-water demand. When conditions become colder, the boilers support the system or take over the duty.
“So what the building management system does is, during the spring and the autumn months the heat pump will do the duty of all the hot water and the heating throughout the school. However, during the depths of winter when it’s really cold outside, the BMS will actually switch across to the boilers to do the work to get the best efficiency out of the systems.”
Ideal Commercial Heating attributes that explanation to Chris Snowden, technical operations manager at Service 2 (HVAC), the contractor involved in the project. It describes the intended sequence of operation; the published material does not provide trend logs or seasonal measurements demonstrating how often each source operated or what savings resulted.
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This arrangement is commonly described as hybrid because it allows two heat sources to be staged around weather, load and system temperature. A heat pump can cover a larger share of demand when outdoor temperatures are favourable, while the boilers provide high-temperature or peak-load capacity when heat losses rise. The control sequence, sensor calibration, weather-compensation settings and commissioning quality will determine whether the intended strategy is achieved in practice.
Why were existing radiators retained?
The case study says the ECOMOD 290HT heat pumps can produce hot water up to 75°C. That manufacturer-reported maximum is important in a retrofit: it means the design could continue using the school’s existing radiators rather than replacing every emitter to suit a lower-temperature system.
The 75°C figure is a capability of the heat-pump product under specified conditions. It is not a measured classroom temperature, a guaranteed operating temperature in every season or evidence that the school achieved a particular comfort level.
Fan-coil units were added in selected areas. This gives the designer another way to deliver heat where existing radiators were unsuitable, undersized or difficult to reposition, while the wider distribution infrastructure could remain in service. Retaining pipework and emitters can reduce disruption in an occupied school, but it also makes survey work and hydraulic balancing essential.
What hydraulic protection was included?
A plate heat exchanger separates the primary circuit serving the new plant from the secondary circuit serving the school. The case study says this protects the new equipment from potentially dirty water in the existing system.
In a retrofit, old pipework and radiators can contain corrosion products, sludge or debris. Hydraulic separation can limit the amount of that material reaching modern heat exchangers and pumps, while also allowing the primary and secondary circuits to be managed at different flow rates and pressure conditions. It does not remove the need to clean, filter, dose and maintain the existing circuit; those tasks should be covered by the project’s water-treatment and maintenance specification.
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What site work was required outside the plant room?
The outdoor heat pumps required a concrete base and fencing. The base provides a stable, level support and helps establish a defined location for service access and condensate management. Fencing provides physical protection and separates the equipment from pupils and other site users.
Schools planning a similar project should consider plant-room access, lifting routes, noise and airflow clearances, defrost-water drainage, fire and electrical requirements, security and the timing of works around the school calendar. The Hawthorn reports confirm the concrete base and fencing, but do not publish acoustic measurements, planning conditions or a detailed construction programme.
What commissioning and warranty terms were reported?
Ideal Commercial Heating says Service 2 received free commissioning for the ECOMOD heat pumps and Evomax 2 boilers. The case study says that commissioning automatically applied a five-year warranty at no extra cost for this project.
Those terms are reported project details, not a standing promise for every future installation. Schools should obtain current warranty wording in writing, including what commissioning records are required, which components are covered, response arrangements, annual service conditions and whether controls, pumps, heat exchangers and water-treatment equipment are included.
What evidence is available about comfort, energy and carbon?
The available sources document the equipment and the manufacturer’s rationale, but they do not publish measured before-and-after indoor temperatures, comfort surveys, gas or electricity consumption, operating costs or carbon emissions for Hawthorn Primary School.
A Modern Building Services report corroborates the hybrid installation and the problem described at the school, but it is a trade report rather than an independent performance evaluation. No named quantitative outcome statistic is available in the reviewed material.
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Consequently, phrases such as “efficient,” “lower carbon,” “reliable comfort” and “consistent internal temperatures” should be understood as the project’s stated aims or the manufacturer’s description. They should not be converted into a percentage saving, emissions reduction or guaranteed room temperature.
What does the Hawthorn design teach other schools?
The project illustrates several decisions that matter when decarbonising or renewing heating in a multi-building school:
- Match sources to weather and load. A BMS-led sequence can assign milder-weather demand to heat pumps and retain boilers for colder or higher-temperature operation.
- Survey the whole distribution system. Existing radiators may be reusable, but only after heat-loss calculations, emitter checks, hydraulic assessment and water-quality review.
- Use separation where old circuits are dirty. A plate heat exchanger can protect new plant from contamination in legacy pipework and provide clearer control of primary and secondary circuits.
- Plan for peak capacity. The two 50 kW heat pumps and three 150 kW boilers are not interchangeable blocks of capacity. The design must state which plant covers base load, peak load, domestic hot water and resilience.
- Design the external compound early. Foundations, fencing, access, drainage, airflow and maintenance clearances can affect layout and cost as much as the plant itself.
- Specify verification, not just equipment. Trend logs, heat-metering, gas and electricity sub-metering, seasonal commissioning checks and room-temperature sampling are needed if the school wants to demonstrate outcomes later.
What should a school request before approving a similar system?
A robust procurement brief should ask bidders to provide:
- A room-by-room heat-loss assessment covering every building and the intended occupancy pattern.
- A hydraulic schematic showing heat pumps, boilers, buffer vessels, heat exchanger, pumps, valves, sensors and safety devices.
- The exact BMS sequence, including changeover temperatures, staging, frost protection, domestic-hot-water priority and manual override.
- Confirmation of radiator and fan-coil suitability at the proposed flow temperatures, with any rooms requiring emitter upgrades identified.
- A water-treatment plan for existing circuits and a maintenance schedule for filters, strainers and heat-exchanger protection.
- Metering and reporting arrangements that can separate heat-pump electricity, boiler gas and delivered heat.
- Commissioning records, operator training, seasonal re-commissioning and a clear warranty schedule.
- Noise, planning, drainage, electrical-capacity and safeguarding information for the outdoor units.
These requirements turn a stated intention to improve comfort into a process that can be checked over time. They also make it easier to distinguish a control problem, a hydraulic imbalance or an undersized emitter from a fault in the heat generators themselves.
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The case study includes a testimonial from Snowden praising the supplier’s technical support: “It’s just easy to deal with Ideal. You’re talking to like-minded people on the other end of the phone who appear to be ex-engineers, or ex-gas engineers, and they know what they’re talking about.” This is a contractor statement published by the manufacturer, not an independent assessment of service quality.
For a school evaluating suppliers, the useful follow-up is documentary: ask for named technical contacts, escalation routes, commissioning responsibilities, spare-parts arrangements and examples of warranty response. A positive testimonial can provide context, but it cannot substitute for contract terms or performance records.
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What is the overall assessment of the Hawthorn installation?
Hawthorn Primary School’s documented solution is a site-specific hybrid retrofit: two 50 kW air-source heat pumps, three 150 kW condensing boilers in cascade, buffer vessels, a plate heat exchanger and targeted fan-coil additions. Its design addresses the practical challenge of serving several buildings while retaining much of an existing radiator and pipework network.
The strongest supported conclusion is that the system was designed to improve operational flexibility and comfort reliability, particularly by using heat pumps in milder weather and boilers when conditions are colder. The published evidence does not support a quantified claim about energy, cost, carbon or achieved room temperatures.
Frequently Asked Questions
Was Hawthorn Primary School’s heating performance independently monitored?
The available case study and trade coverage describe the installation but do not publish an independent monitoring report. They contain no verified before-and-after energy, cost, emissions or room-temperature dataset.
Does the reported 75°C heat-pump capability mean classrooms were heated to 75°C?
No. The figure refers to the manufacturer’s reported maximum hot-water output capability of the heat-pump model. Classroom comfort depends on emitter sizing, controls, weather, airflow and room heat loss, not on a 75°C room temperature.
What measurements would prove whether a school hybrid system is saving energy?
A school would need separate gas and heat-pump electricity meters, delivered-heat measurement, BMS trend logs and a documented baseline adjusted for weather and occupancy. Indoor temperature sampling and comfort feedback would add evidence about whether energy performance came at the expense of usable comfort.
Can a hybrid system be added without replacing every radiator?
Potentially, if a heat-loss and emitter survey confirms that existing radiators can meet design loads at the available flow temperatures. Areas that cannot may need larger radiators, fan-coil units or another local upgrade; the Hawthorn project added fan coils only in selected areas.
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