Key Information
- 210-litre capacity — ideal for larger homes, apartments, and electrically heated properties
- Internal overflow design — suitable where external overflow arrangements are not possible
- Open-vented thermal store — not subject to Part G Building Regulations
- No G3 qualification required — simplifies installation requirements
- 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
- Stainless steel corrugated coils — provide rapid heat transfer and recovery
- Tough polyethylene outer shell — helps resist accidental damage
- Polypropylene inner tank — non-corrosive and suitable for poor water quality areas
- Low maintenance design — minimal servicing requirements and low lifetime costs
- Reduced Legionella risk — supports improved water hygiene
- Easy installation — designed for straightforward fitting
- 5-year warranty — added peace of mind
What's Included
- Harlequin HeatStream Electric 210L Direct Mains Hot Water System Internal Overflow - HS210E-IOF
The Harlequin HeatStream Electric 210L Direct Mains Hot Water System Internal Overflow is designed for properties with higher hot water demands while offering additional installation flexibility through its fully internal overflow system. With a substantial 210-litre capacity, it is ideal for larger households, apartments, and electrically heated homes where a reliable supply of hot water is essential throughout the day.
The integrated internal overflow feature helps manage excess water safely, contributing to the system's reliability, longevity, and ease of maintenance.
Flexible Installation for Challenging Locations
The HS210E-IOF is an open-vented thermal store, meaning it is not subject to Part G Building Regulations or the discharge requirements associated with traditional unvented cylinders. Where routing an overflow externally or to a suitable low-temperature waste pipe is not possible, the internal overflow design provides a practical alternative.
This makes it particularly useful for installations where traditional overflow arrangements would be difficult or impractical.
Fast Hot Water Recovery
The system features a secondary fast heat-up boost immersion heater capable of delivering up to 50 litres of hot water in approximately 20 minutes. This ensures additional hot water is available quickly when demand increases unexpectedly.
Large-surface-area stainless steel corrugated coils provide rapid heat transfer, helping maintain consistent hot water performance throughout the day.
Energy Efficient Operation
With an ErP B energy efficiency rating and low standing heat losses of only 1.12kWh per day, the HeatStream 210 Internal Overflow model is designed to minimise energy waste. It can also help maximise the benefits of off-peak electricity tariffs and solar PV installations, supporting lower running costs where suitable energy sources are available.
This makes it an efficient option among modern hot water cylinders.
Durable, Reliable, and Low Maintenance
The outer shell is manufactured from tough polyethylene, helping protect the system against accidental damage, while the inner tank is constructed from non-corrosive polypropylene, making it particularly suitable for areas with poor water quality.
With very few moving parts and only a simple six-monthly top-up requirement, maintenance is minimal. The design also helps reduce the risk of Legionella, providing additional reassurance for homeowners.
Ready to Upgrade Your Hot Water System?
If you're looking for efficient hot water cylinders that offer flexible installation, excellent hot water performance, and low running costs, the Harlequin HeatStream Electric 210L Internal Overflow model is an excellent choice. Order today from PlumbNation and experience the benefits of modern thermal store cylinders designed for reliable everyday hot water delivery.
