Harlequin HeatStream Electric 210L Direct Mains Hot Water System

Key Information

• 210-litre capacity — ideal for larger homes, apartments, and electrically heated properties
• Open-vented thermal store design — not subject to Part G Building Regulations
• Mains pressure hot water — delivers strong and consistent performance
• Secondary boost immersion heater — provides up to 50 litres of hot water in approximately 20 minutes
• ErP B energy rating — supports efficient energy usage
• Low standing heat loss — only 1.12kWh per day
• Compatible with off-peak electricity tariffs — helps reduce running costs
• Suitable for use with solar PV systems — maximises renewable energy generation
• Compact 520mm x 520mm footprint — ideal for smaller airing cupboards
• Reduced legionella risk — supports improved water hygiene
• Suitable for replacement thermal stores — ideal for upgrading older systems
• 5-year warranty — added peace of mind

What's Included

• Harlequin HeatStream Electric 210L Direct Mains Hot Water System - HS210

The Harlequin HeatStream Electric 210L Direct Mains Hot Water System is designed to deliver reliable hot water for larger households, spacious apartments, and electrically heated homes. With its substantial 210-litre capacity, it provides a dependable supply of hot water for multiple bathrooms, kitchen use, showers, and baths, even during periods of high demand.

Combining efficient performance with a compact footprint, it offers a practical alternative to traditional hot water cylinders.

Open-Vented Thermal Store Technology

The HS210 operates as an open-vented thermal store, meaning it is not subject to Part G Building Regulations or the discharge requirements associated with traditional unvented cylinders. This removes the need for expansion vessels, temperature and pressure relief valves, and G3-qualified installers.

As a result, these thermal store units can often be installed more simply and cost-effectively than conventional unvented systems.

Fast Hot Water Recovery

The system incorporates a secondary fast heat-up boost immersion heater capable of providing up to 50 litres of hot water in approximately 20 minutes. This helps ensure additional hot water is available quickly when demand increases unexpectedly.

Large-surface-area stainless steel corrugated coils deliver rapid heat transfer, helping maintain a consistent supply of hot water throughout the day.

Energy Efficient Performance

With an ErP B energy efficiency rating and low standing heat losses of just 1.12kWh per day, the HeatStream 210 is designed to help reduce energy waste. It can also maximise the benefits of off-peak electricity tariffs and solar PV systems, helping homeowners make better use of lower-cost or renewable energy sources.

This makes it a highly efficient option for modern homes seeking dependable hot water performance.

Compact, Durable, and Low Maintenance

Despite its larger capacity, the HeatStream 210 features a compact 520mm x 520mm square footprint, making it suitable for smaller airing cupboards and replacement installations.

The outer shell is manufactured from tough polyethylene to help protect against accidental damage, while the inner tank is made from non-corrosive polypropylene, making it ideal for areas with poor water quality. With minimal servicing requirements and only a simple six-monthly top-up, ongoing maintenance costs remain low.

Ready to Upgrade Your Hot Water System?

If you're looking for high-performance hot water cylinders that combine efficient operation, simplified installation, and reliable hot water delivery, the Harlequin HeatStream Electric 210L is an excellent choice.