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Optimizing Heating Systems with EPH Controls Priority Hot Water Pack - PDHW

Welcome to our comprehensive guide on optimizing heating systems using the EPH Controls PDHW control pack in conjunction with OpenTherm® technology. In this article, we will explore the key components of the PDHW control pack and delve into how it can significantly improve the efficiency of heating systems. By implementing this solution, you can achieve lower flow and return temperatures, leading to enhanced heating circuit efficiency and the ability for the boiler to operate within its condensing range. What is Priority Hot Water - read our post here.


Understanding the PDHW Control Pack

The EPH Controls Priority Hot Water Pack - C00P-221981 is a remarkable solution designed to optimize heating systems by working seamlessly with OpenTherm® technology. It consists of the following key components:


CP4 RF Room Thermostat

The CP4 RF Room Thermostat is a cutting-edge wireless thermostat that allows users to set and control the desired room temperature with precision. Its intuitive interface and advanced features enable homeowners to efficiently manage their heating systems while maximizing energy savings.


CP4-HW Hot Water Thermostat

The CP4-HW Hot Water Thermostat is another vital component of the control pack, dedicated to optimizing hot water management. It enables users to regulate hot water production, ensuring a constant supply of hot water without unnecessary energy wastage.


Two 2 Port 22mm Motorised Valves

The two 2 Port 22mm Motorised Valves serve as essential assets in controlling the flow of water within the heating system. These valves play a pivotal role in enabling zoning and providing precise control over the distribution of heated water throughout the property.


Wiring Center

The wiring centre acts as the central hub that connects and coordinates the various components of the PDHW control pack. Its well-designed layout simplifies installation and ensures a reliable and efficient connection between the thermostat, motorised valves, and boiler.


Priority Hot Water Pack – PDHW

Achieving Higher Heating Efficiency

The primary goal of the Priority Hot Water - PDHW control pack is to enhance heating efficiency significantly. It accomplishes this by reducing the boiler's demand and allowing it to operate within its condensing range. Let's explore how this happens:


Demand Reduction

The CP4 RF Room Thermostat and CP4-HW Hot Water Thermostat work in tandem to optimize heating and hot water production based on the actual needs of the property. By providing accurate and real-time temperature data, these thermostats ensure that the boiler only activates when necessary, reducing overall energy consumption.


Lower Flow and Return Temperatures

One of the key benefits of using the PDHW control pack is its ability to achieve lower flow and return temperatures in the heating circuit. The precise control provided by the motorised valves ensures that the heated water is distributed either to the heating circuit or hot water circuit separately, with hot water taking priority, resulting in more efficient modulation of the output from the boiler. As a result, the heating circuit can operate with lower return temperatures while still maintaining the desired comfort levels.


Operating within the Condensing Range

Modern boilers are designed to operate more efficiently when working within their condensing range. The PDHW control pack's demand reduction and lower flow/return temperatures enable the boiler to consistently stay within this optimal range, maximizing energy efficiency and reducing fuel consumption.



The EPH Controls Priority Hot Water Control Pack, in conjunction with OpenTherm® technology, presents a revolutionary solution for optimizing heating systems. By incorporating the CP4 RF Room Thermostat, CP4-HW Hot Water Thermostat, two 2 Port 22mm Motorised Valves, and a wiring centre, this pack ensures higher heating efficiency, reduced energy consumption, and enhanced user comfort. With the ability to operate the boiler within its condensing range, homeowners can achieve significant energy savings while contributing to a greener environment.


Investing in the EPH Controls PDHW control pack is a wise choice for any property owner seeking to improve their boiler and cylinder heating system's performance and lower energy bills. Embrace the future of heating technology today and take the first step toward a more efficient and sustainable future.

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