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HISA HOT WATER
Hot water cylinders designed for heat-pump systems: standard HPT cylinders and HPTB cylinders combining domestic hot water storage with an integrated 50-litre buffer.
150L / 200L / 300L
STANDARD HPT CYLINDERS
The standard HPT range offers three nominal capacities for different homes and hot water requirements. For a combined hot water and buffer solution, explore the HPTB range below.
Duplex 2205 inner tank for corrosion resistance and long service life.
A stainless steel corrugated coil designed for effective heat transfer.
High-density polyurethane insulation helps minimise heat loss.
Standard HPT: 3.0 kW / 220 V immersion heater with thermostat. HPTB uses a separately specified 230 V heater.
A galvanized steel outer shell, built for long-term performance.
THE HPT RANGE
Compare the range below. Choose a capacity to view its dimensional drawing and, on mobile, its technical data.
| Specification | 150 LHPT-150L | 200 LHPT-200L | 300 LHPT-300L |
|---|---|---|---|
| Capacity | 150 L | 200 L | 300 L |
| Outer diameter | Ø470 mm | Ø560 mm | Ø600 mm |
| Total height | 1410 mm | 1312 mm | 1572 mm |
| Inner tank diameter | Ø370 mm | Ø470 mm | Ø500 mm |
| Inner tank | Duplex 2205 | Duplex 2205 | Duplex 2205 |
| Inner tank thickness | 1.0 mm | 1.0 mm | 1.0 mm |
| Outer shell | Galvanized Steel | Galvanized Steel | Galvanized Steel |
| Outer shell thickness | 0.5 mm | 0.5 mm | 0.5 mm |
| Insulation | Polyurethane · 50 ± 3 mm | Polyurethane · 45 mm | Polyurethane · 50 mm |
| Coil material | SUS316L | SUS316L | SUS316L |
| Coil size | Ø28 × 15 m | Ø28 × 20 m | Ø28 × 25 m |
| Maximum working pressure | 0.8–1.0 MPa | 0.8–1.0 MPa | 0.8–1.0 MPa |
| Electric heater | 3.0 kW / 220 V · with thermostat | 3.0 kW / 220 V · with thermostat | 3.0 kW / 220 V · with thermostat |
| Connections | Female BSP | Female BSP | Female BSP |
Standard HPT pressure clarification remains pending: the current specification lists 0.8–1.0 MPa, while a drawing identifies that range as test pressure. Confirm working and test ratings with HISA before installation; do not apply the separate HPTB ratings to these models.
STANDARD HPT / DIMENSIONS & CONNECTIONS
Vector engineering artwork from the supplied original drawings. Dimensions in mm; do not scale from the screen.
Connection labels and female BSP sizes follow the original engineering drawing. Source baffle notes are retained where supplied.
The source also shows an unlabelled connection at 1080 mm. Confirm its size and function with HISA.
Vector engineering artwork from the supplied original drawings. Dimensions in mm; do not scale from the screen.
Connection labels and female BSP sizes follow the original engineering drawing. Source baffle notes are retained where supplied.
Vector engineering artwork from the supplied original drawings. Dimensions in mm; do not scale from the screen.
Connection labels and female BSP sizes follow the original engineering drawing. Source baffle notes are retained where supplied.
STANDARD HPT / WRAS
25-YEAR HISA INNER-VESSEL WARRANTY
Eligible HISA stainless-steel hot water cylinders carry a 25-year manufacturer warranty on the qualifying inner stainless-steel water vessel against defects in materials or manufacture.
Subject to registration, installation, annual servicing and the HISA Warranty Terms. Valves, immersion heaters, sensors, controls, expansion vessels and accessories are not included in the 25-year vessel warranty; their applicable periods require HISA confirmation.View HISA Warranty Terms
WRAS approved for use with potable water systems.
Applies to standard HPT-150L, HPT-200L and HPT-300L only. No approval is inferred for HPTB models.
INTEGRATED BUFFER CYLINDERS
HISA HPTB cylinders combine domestic hot water storage with an integrated 50-litre buffer in one unit, helping simplify heat-pump system design and reduce the number of separate components required inside the home.
Functional concept only. Not to scale; no internal layout or connection position is implied.
HISA INTEGRATED BUFFER
150L hot water+50L buffer
560 mm diameter · 1525 mm height
VIEW TECHNICAL DATA ↗HISA INTEGRATED BUFFER
200L hot water+50L buffer
560 mm diameter · 1760 mm height
VIEW TECHNICAL DATA ↗Domestic hot water capacities are nominal designations; integrated buffer capacity is stated separately. Working pressure is 6 bar; maximum test pressure is 10 bar. The test rating is not an operating pressure.
| Specification | HPTB-150/50L | HPTB-200/50L |
|---|---|---|
| Domestic hot water capacity | 150 L nominal | 200 L nominal |
| Integrated buffer | 50 L | 50 L |
| Overall source capacity | 150 L + 50 L | 200 L + 50 L |
| Outer diameter | 560 mm | 560 mm |
| Inner tank diameter | 470 mm | 470 mm |
| Height | 1525 mm | 1760 mm |
| Inner tank material | Duplex 2205 stainless steel | Duplex 2205 stainless steel |
| Inner tank thickness | 1.0 mm | 1.0 mm |
| Outer casing | Painted galvanised steel | Painted galvanised steel |
| Outer casing thickness | 0.5 mm | 0.5 mm |
| Insulation | Polyurethane foam · 45 mm | Polyurethane foam · 45 mm |
| Electric heater | 3.0 kW / 230 V · With thermostat | 3.0 kW / 230 V · With thermostat |
| Heater connection | G1-1/2 screwed type | G1-1/2 screwed type |
| Heat exchanger | SUS316L | SUS316L |
| Coil | Ø28 mm × 15 m | Ø28 mm × 20 m |
| Heat exchanger surface | 2.0 m² | 2.6 m² |
| Working pressure | 6 bar | 6 bar |
| Maximum test pressure | 10 bar | 10 bar |
F indicates female. Exhaust thread gender is not specified. This is a connection schedule, not a port-location drawing; dedicated buffer circuit connections and positions require confirmed installation information.
| Connection | Both HPTB models |
|---|---|
| Hot water outlet | G1 F |
| Cold water inlet | G1 F |
| Coil inlet/outlet | G1 F |
| Mg. anode | G1 F |
| Exhaust | G3/4 · gender not specified |
| Water drain | G3/4 F |
| Temperature sensor hole | G3/4 F |
25-year HISA cylinder warranty on the qualifying stainless-steel inner vessel, subject to HISA warranty terms. Ancillary components are not included in the 25-year vessel warranty.
HISA WARRANTY TERMS ↗HISA Hot Water
HPT standard + HPTB integrated bufferHPT-150L | HPT-200L | HPT-300L | HPTB-150/50L | HPTB-200/50L
Standard HPT and integrated-buffer HPTB cylinders: product benefits, verified specifications, connections and HISA support.
ONE HISA SYSTEM
HISA supplies standard HPT and integrated-buffer HPTB hot water cylinders to complement heat-pump installations. Choose the configuration that suits the system design.
YOUR NEXT STEP
Heating and hot water designed to work together.
Contact our team for help finding an installer and planning your HISA system.
enquiries@hisauk.com0141 530 2010
