HS 150DI

A HOT WATER REVOLUTION - Safe, quick & easy installation!

A pioneering advancement in hot water storage, the Harlequin HeatStream range was created from a collaboration of industry expertise in both the rotational moulding of plastic tanks, and pressurised hot water storage systems. By sharing these experiences, Harlequin have created a hot water system similar to that of a typical unvented hot water cylinder, but superior.  

Why the Harlequin HeatStream is your superior Hot water System…

Effortless -  The system produces mains pressurised hot water without all the drawbacks of traditional vented, unvented hot water storage cylinders or thermal stores.

Endurance -  Heat transfer fluid is enclosed within the most suitable material, long lasting non corrosive heat durable polypropylene. This also makes the system tough and robust reducing the impact of shipping and storage mishaps. 

Design - A more convenient square footprint shape, especially where space is a premium. All systems can fit  easily through a  standard door width.  More hot water storage potential within a smaller footprint.

Versatility - The range is compatible with electric, oil, gas, solar thermal heat sources.   The Twin range accommodates multiple heat sources including solar thermal.

  • Produces Mains pressurised hot water on demand
  • Safe, quick and easy installation
  • 25 Year Warranty, peace of mind for a generation*
  • Low heat loss due to high levels of insulation
  • No pressure test certification required to install the system
  • System shape can fit neatly into many locations and through a standard door width
  • Easy installation of a secondary return system
  • Tough and durable plastic casing reducing impact of shipping and storage mishaps
  • Compact system for commercial installations
  • Non corrosive polypropylene storage tank
  • Top Positioned Premium Boost Immersion for ultrafast heat up
  • Variable thermostatic mixing valve which can prevent water exceeding 450C at outlets
  • Immersion & thermostats protected behind durable protective cover
*2 year internal components. 
HS 150 Direct

Width: 520mm
Length: 520mm
Height: 1,315mm

Empty Weight: 36kg 
Filled Weight: 188kg 

ErP Rating: B (click here to view label)
Standing Heat Loss: 47W
Heat up time 600C: 78mins 
(refers to the period required to raise the temperature from 150C - 600C)

Additional Information

Outer Tank: Polyethylene
Inner Tank: Polypropylene 
Internal Coils: Stainless Steel
Immersion Heater: 2x 3kw Immersion Heaters 
Hot Water Coil Inlet/Outlet Connections: 22MM Pipe Tail 
Overflow: 3/4"F 
Hot Water Coil Operating Pressure (max.): 3 bar 
Insulation, Sides & Bottom: 60mm
Insulation, Top: 120mm
Warranty: 25 year tank body, 2 year internal components 

Draw Off Volumes*

600C Core Temperature: 113L 
650C Core Temperature: 128L 
700C Core Temperature: 180L 

*15 litres per minute flowrate & usable hot water above 400C.

Download - Operational Maintenance Manual 
Heatstream Hot Water System by Harlequin.
HeatStream - Operational Maintenance Manual
Issue 0519
Harlequin HeatStream 4pg A5 leaflet.
Harlequin HeatStream Case Study
Our hot water system range, Harlequin HeatStream, has been well received by installers and customers. Do read this case study to understand why it has been well received.