Maintain Peak Performance of Your Heat Pump with Sentinel Solutions
Since its founding in 1988, Sentinel has led the way in advanced water treatment solutions. As the UK intensifies its focus on achieving net-zero emissions, transitioning to low-carbon heating such as heat pumps is becoming essential. Nisar Afsar, Technical Director at Sentinel Performance Solutions, highlights why system water treatment is just as crucial in heat pump installations as in traditional heating systems and explains the additional considerations unique to low-temperature systems.
Over the past 37 years, Sentinel has built deep industry expertise through close collaboration with appliance manufacturers. This experience has taught us that effective water treatment and filtration are fundamental to the longevity and performance of all heating appliances - whether it’s a gas boiler, electric heater, or a modern heat pump.
Even in the best circumstances, heating systems are rarely free of contaminants. Over time, debris can accumulate, making a reliable filter a key safeguard - an “insurance policy” that protects the appliance from circulating particles, reduces the risk of breakdowns, and helps extend operational life.
One of our core aims is to empower our customers with knowledge - supported by solid evidence. We encourage installers and engineers to consider the consequences of corrosion, debris, and limescale, and how these issues can be mitigated through the correct use of water treatment products and filtration systems.
Sentinel has worked closely with both equipment manufacturers and regulatory bodies, contributing to updates in key legislation. Notably, the June 2022 revisions to Part L of the Building Regulations - focused on fuel and energy conservation - incorporated BS7593, which outlines the essential steps for commissioning heating systems. These include a thorough clean and flush, installation of a suitable filter, and the use of water treatment inhibitors to protect the system.
When comparing standard filters to those designed for heat pumps, it’s helpful to begin with what they have in common. One of the most persistent issues in any heating system is the formation of iron oxide ‘sludge’. This results from corrosion in steel components such as radiators, pipework, and heat exchangers. As this sludge circulates, it can severely affect system performance and reliability.
Magnetic filters are designed to capture these insoluble ferrous particles and can be used across various systems - be it gas, oil, electric, or heat pump installations. However, heat pump systems introduce additional challenges. Alongside typical contaminants like magnetic sludge, limescale, and installation debris, they may contain non-magnetic particulates that evade standard magnetic filtration.
In systems using glycol as a heat transfer fluid, the glycol can degrade over time and form thick, jelly-like contaminants that magnetic filters cannot capture. To address this, Sentinel developed the Vortex700 - a dual-action heat pump filter featuring a powerful 9000 gauss magnet for magnetic debris and an 800-micron sieve to catch non-magnetic particles. This ensures peak system efficiency and protects the heat pump and its components for the long term.
One distinct issue with heat pumps is microbiological contamination - far less common in high-temperature traditional systems. Because heat pumps operate at lower temperatures, they can foster bacterial or algal growth if not properly treated, especially in setups like underfloor heating that lack copper or steel components.
We’re actively working to raise awareness that biocide treatment is essential in heat pump systems. Heat pumps typically heat water to just 40-45°C - an ideal range for microbial growth if glycol is present and untreated.
In addition to biocides, inhibitors are necessary to combat corrosion and scale - just like in traditional systems. Historically, convincing installers to add even a single treatment was challenging. Now, we’re urging the use of two (biocide and inhibitor) which requires a shift in mindset. But the logic is clear: prevention is always less costly and disruptive than cure. Addressing system contamination after issues arise is far more complex and expensive than proactive treatment from day one.
For more information about Sentinel’s full range of heat pump-specific solutions, visit:
