Printed Circuit Boards & Controls

Printed circuit boards and electronic control components are the central operating systems within modern water heaters, HIUs and unvented hot water systems, managing temperature regulation, safety monitoring, diagnostics and overall system performance. When a fault occurs, replacing the correct PCB or control assembly can often restore full functionality without the need to replace the entire appliance.

This collection includes genuine PCB assemblies, controller boards, power supply boards, sensors and electronic control modules designed for use with a wide range of Heatrae Sadia, Megaflo, Baxi and Santon systems. Whether you're diagnosing communication faults, power issues, unresponsive controls or intermittent system errors, selecting the correct replacement component is essential for safe and reliable repair.

All components are chosen to support professional engineers, facilities teams and maintenance contractors, helping ensure system compatibility, dependable operation and long-term performance across commercial and domestic hot water applications.