Key Information
- 150-litre capacity — ideal for family homes, apartments, and electrically heated properties
- Internal overflow design — suitable where external overflow connections are not practical
- 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 tariffs — helps reduce running costs
- Suitable for use with solar PV systems — maximises renewable energy usage
- Stainless steel corrugated coils — provide rapid heat transfer and recovery
- Durable polyethylene outer shell — helps protect against accidental damage
- Polypropylene inner tank — non-corrosive and ideal 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 — long-term peace of mind
What's Included
- Harlequin HeatStream Electric 150L Direct Mains Hot Water System Internal Overflow - HS150E-IOF
The Harlequin HeatStream Electric 150L Direct Mains Hot Water System Internal Overflow has been designed for properties where a traditional external overflow connection may not be practical. Featuring a fully internal overflow solution, it offers greater installation flexibility while still delivering reliable mains pressure hot water for everyday use.
With a generous 150-litre capacity, it is ideal for family homes, flats, apartments, and electrically heated properties that require a dependable supply of hot water throughout the day.
Internal Overflow for Easier Installation
One of the key benefits of the HS150E-IOF is its ability to operate without requiring an external discharge pipe. Where routing an overflow externally or into a low-temperature waste pipe is not possible, this internal overflow model provides an effective alternative.
As an open-vented thermal store, it is not subject to Part G Building Regulations or the discharge requirements associated with traditional unvented cylinders, helping simplify installation considerably.
Fast Hot Water Recovery
The system includes a secondary fast heat-up boost immersion heater capable of delivering up to 50 litres of hot water in as little as 20 minutes. This helps ensure hot water is available when demand suddenly increases, making it particularly useful in busy households.
Large-surface-area stainless steel corrugated coils provide rapid heat transfer, helping maintain efficient hot water production throughout the day.
Energy Efficient Performance
The HeatStream Internal Overflow model achieves an ErP B energy efficiency rating and features exceptionally low standing heat losses of just 1.12kWh per day. It can also help homeowners maximise the benefits of off-peak electricity tariffs and solar PV systems, reducing energy costs where suitable tariffs or renewable energy sources are available.
This makes it a highly efficient addition to modern heating installations.
Durable and Low Maintenance Design
The outer shell is manufactured from tough polyethylene, helping protect against accidental damage, while the inner tank is constructed from non-corrosive polypropylene that performs particularly well in areas with poor water quality.
With very few moving parts and only a simple six-monthly top-up requirement, ongoing maintenance is minimal. The design also helps reduce the risk of legionella, providing additional reassurance for homeowners.
Ready to Upgrade Your Heating System?
If you're looking for an efficient alternative to traditional cylinders and storage tanks, the Harlequin HeatStream Electric 150L Internal Overflow model offers reliable hot water performance, flexible installation options, and low running costs. Order today from PlumbNation and enhance your property's heating system with a modern, energy-efficient solution.
