Coming Soon - BWT Pearl HPT Inverter Pool Heat Pump - Top Discharge - 9kW to 20kW

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Model

Pearl HPT 9 - 9.5kW Pearl HPT 12 - 12.8kW Pearl HPT 15 - 15.3kW Pearl HPT 18 - 18.2kW Pearl HPT 20 - 20.1kW

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BWT Pearl HPT Inverter Pool Heat Pump - Top Discharge

The intelligent swimming pool heat pump. Vertical air discharge, full DC inverter, Wi-Fi control and a 25 year titanium heat exchanger warranty.

Physically Stocked, unlike most 'drop-shipping' websites.
Shipped from VIC, NSW, QLD, WA

The BWT Pearl HPT discharges air vertically out of the top of the unit rather than out the front or rear. That makes it the pick for tight equipment areas, narrow side passages and installations sitting close to a wall or fence, where there is simply no room to exhaust horizontally without recirculating air back through the evaporator.

Underneath the round cabinet it is the same Pearl inverter platform - variable speed compressor, brushless fan, colour touch screen and BWT Connect Wi-Fi as standard.

Key Features

Top air discharge - ideal where space around the unit is restricted
Full DC inverter - efficient and quiet across the whole operating range
Intelligent operating mode - autoregulates output from water and air temperature
Three operating modes - Boost, Smart and ECO
Heating, cooling and automatic modes, colour digital touch screen
BWT Connect inside - Wi-Fi fitted as standard, smartphone control and TechniCenter supervision
Low noise levels - insulated panels with automatic compressor and fan speed adjustment
Exclusive low temperature system - reverse-cycle defrost, compressor preheating, evaporator antifreeze
Titanium heat exchanger - suited to salt, mineral and chlorinated water

Models and Heating Capacity

Model	Product Code	Heating Capacity	Air Discharge
Pearl HPT 9	HPT9	9.5 kW	Top
Pearl HPT 12	HPT12	12.8 kW	Top
Pearl HPT 15	HPT15	15.3 kW	Top
Pearl HPT 18	HPT18	18.2 kW	Top
Pearl HPT 20	HPT20	20.1 kW	Top

BWT Smart Control

Advanced double-entry regulation anticipates the pool energy requirement by cross-referencing air and water temperature, so the compressor and fan deliver only the power the pool actually needs. Oversized exchangers paired with the inverter compressor lift the seasonal COP, while the brushless variable speed fan keeps noise to a minimum.

Boost Mode - fastest heat-up, maximum output
Smart Mode - balanced output and running cost
ECO Mode - lowest energy consumption and lowest noise

BWT Connect and the TechniCenter

A Wi-Fi device is fitted as standard inside every Pearl inverter heat pump and is reached through a side panel. Pair it by scanning the QR code on the machine, entering the network security code and pressing the pairing button.

Connected units report to the BWT TechniCenter, where technicians can read error codes, access settings through a secure interface and adjust, optimise or update the heat pump remotely over Modbus - often resolving a fault without anyone attending site.

Power Supply

Single phase across the full 9kW to 20kW range
Electrical connection must be carried out by a licensed electrician

Warranty

25 years - titanium heat exchanger
10 years - compressor
5 years - parts

Which Discharge Direction Do I Need

Top discharge units exhaust upward, so they can be sited closer to walls and in narrow plant areas without recirculating their own cold exhaust air. Front discharge units need clear space in front of the fan. If your equipment pad is tight against a boundary fence or tucked into a side passage, the HPT is usually the safer choice. Always leave the clearances specified in the installation manual around the air intake.

Note: This product must be installed and serviced by a qualified pool equipment technician or licensed professional. We carry more spare parts than anyone.

Manufacturer Brochures, Manuals & Part Numbers

Need specifications, dimensions, wiring diagrams or more product information? See the manufacturer documents:Top Discharge Heat Pump Brochure

To the layperson, plumbing sizes and their names can be confusing due to the nominal sizes and naming conventions used.

This is not something we made up. Plumbers and manufacturers have used nominal (meaning ‘by name only’) sizing for decades.

Simply put, in plumbing, named sizes are often not the actual measurements of the pipe, fitting, or part. A PVC pipe called “50mm” or “2"” does not measure 50 mm anywhere. Instead, it follows nominal sizing, an internationally-standardised naming system.

Almost all fittings we use in the pool & spa industry use “pressure PVC” pipe & fittings. Do not confuse with “DWV” or other pipe & fittings and their names and sizes.

Use the Outside Diameter (OD) to check your pipe against fittings. Below is a quick reference for common spa & pool pipe sizes:

Imperial Name	Metric Name	Pipe Diameter (OD)
1/2"	15mm	~21.2–21.5 mm
3/4"	20mm	~26.6–26.9 mm
1"	25 mm	~33.4–33.7 mm
1.5"	40 mm	~48.1–48.4 mm
2"	50 mm	~60.2–60.8 mm
2.5"	65 mm	~75.2–75.5 mm

To reiterate, these are nominal sizes and are designed to fit matching fittings — not to measure what their name suggests. These are based on PVC Pressure Pipe AS/NZ 1477 Dimensions^1.

º Internal diameters vary slightly by manufacturer and class.
¹ Not all pool/spa fittings match these dimensions exactly. Some do not follow Australian or international standards. Chinese spas may use proprietary fittings.

Understanding Plumbing Sizes & Nominal Measurements

Plumbing sizes can be confusing. PVC and many other pipe systems use nominal sizes—the size is a name, not the exact measured dimension. This convention is used across most pool and spa systems and other plumbing areas so that pipes and fittings remain compatible.

Quick example: A 2" / 50 mm fitting is named for the pipe it connects to, but the pipe’s actual outside diameter (OD) is approx. 60.3 mm (typically ~60.2–60.5 mm in AS/NZ pressure pipe).

Another example: a 2” / 50mm o-ring may refer to a barrel union, etc that suits 50mm pipe. Eg: a “50mm Balboa Gasket” refers to a heater gasket that measure 74mm across, but suits a Balboa barrel union made for 50mm pipe (and the 50mm pipe does not measure 50mm either!)

Why pipe sizes don’t match the measurements

The Nominal Pipe Size (NPS) system standardises pipe dimensions so that pipes, fittings, valves, and accessories interoperate.

Plumbers work with these nominal names every day, but DIYers can be tripped up if they try to match by a tape-measure alone.

How to Measure Pipe Correctly

Pipe size is identified by:
- The pipe’s Outside Diameter (OD).
- The fitting’s Inside Diameter (ID) (socket opening).
Pipe Class / Schedule (e.g., Class 9, 12, 18 or Sch 40) relates to wall thickness and therefore the Internal Diameter (ID) and pressure rating.
The outside diameter of a fitting is not useful (wall thickness varies by manufacturer).

Important: For pool/spa work, most plumbing uses Pressure Pipe (AS/NZ standards) — not DWV. Always check OD and the pipe class against your equipment specifications.

Hose & Tube Dimensions

Common flexible hose sizes used in pool/spa systems (approximate IDs).

Imperial Name	Metric Name	Inside Diameter (ID)
3/8"	9–10 mm	~9 mm
3/4"	19 mm	~19 mm

BSP – British Standard Pipe Thread Sizes

BSP thread names are also nominal. The thread OD will not equal the nominal name.

BSP Thread Size Naming	Outside Diameter (mm / inch)	TPI
1/16" BSP	7.7 mm / 0.304"	28
1/8" BSP	9.7 mm / 0.383"	28
1/4" BSP	13.16 mm / 0.518"	19
3/8" BSP	16.66 mm / 0.656"	19
1/2" BSP / 15 mm	20.99 mm / 0.825"	14
5/8" BSP	22.99 mm / 0.902"	14
3/4" BSP / 20 mm	26.44 mm / 1.041"	14
7/8" BSP	30.20 mm / 1.189"	14
1" BSP / 25 mm	33.25 mm / 1.309"	11
1-1/4" BSP	41.91 mm / 1.650"	11
1-1/2" BSP / 40 mm	47.80 mm / 1.882"	11
2" BSP / 50 mm	59.61 mm / 2.347"	11
2-1/4" BSP	65.71 mm / 2.587"	11
2-1/2" BSP	75.18 mm / 2.960"	11
3" BSP	87.88 mm / 3.460"	11
4" BSP	113.03 mm / 4.450"	11
5" BSP	138.43 mm / 5.450"	11
6" BSP	163.83 mm / 6.450"	11

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HPT9

Important Information

Delivery Pricing & Options

*Free Road Shipping on orders over $149.00 Australia-wide
Capped Road Freight Shipping at $19.95
Express Post available on many products. Contact us before ordering if urgent.
Shipping to Australia & New Zealand Only
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About Us

Heater & Spa Parts is built on decades of real pool and spa industry experience, from manufacturer R&D and consulting to in-field spa repairs, pool heater servicing, trade support and diagnostics.
We understand how the equipment works, why it fails, and why it should be replaced.
More Parts than Anyone

We are a real Australian store with real stock, not a drop shipper.
With 100,000+ parts across 10,000+ product lines, we stock spa parts, pool heater parts, filters, pumps, jets, chemicals, touchpads, control panels, manuals and more, backed by fast dispatch and practical advice.
Pick-Ups

Pickup for many items is available from our Carrum Downs, VIC store at 10 Industry Blvd, Carrum Downs.
If pick-up is urgent, contact us before ordering.
Our NSW, QLD and WA warehouses currently ship orders only, with no retail counter available yet.

Brand Information

We are an authorised dealer, retailer, and/or service & warranty agent for many leading brands, including: Fluidra (AstralPool, Zodiac, Hurlcon), Aeware, Air Supply of the Future, Aqua-Flo, Balboa, Celsior, CG Air, CMP, Custom Moulded Products (CMP), Darlly, Davey, Del Ozone, Dontek, Edgetec, Emaux, Filtrite, Gecko, Goulds, Harwil, Henden, Herga, Honeywell, HydroAir, HydroQuip, ITT, Jandy, Joyonway, Laing, Len Gordon, Lo-Chlor, LX, LX Whirlpool, Magic Plastics, Magnum, Monarch, Onga, Pentair, PoolSystems, Presair, Raypak, Reemay, Rheem, Rising Dragon, S&P, Sensaheat, Spa-Craft, Spa-King, SpaNet, Spa-Quip, SpaTex, SpaZazz, Tecmark, Therm Products, Thermcore, Waterco, Waterway, Weld-On, Whirlpool, Xylem, and others.

We also sell parts for many spa and swim spa brands, including parts to suit Alpine Spas, Artesian Spas, AquaPulse Spas, Balboa spas, Bullfrog Spas, Caldera Spas, Canadian Spa Company, Cedar Spas, Chinese import spas, Coast Spas, Costco spas, Cyclone Spas, Davey spas, Decina, Designer Spas, Dimension One Spas, eBay spas, Endless® Spas, Fastlane Pools, Fisher Spas, Gecko spas, Halo Spas, H2O Spas, H20 Spas, Heritage Spas, HotSpring Spas, HydroQuip spas, Impact Spas, Jacuzzi, Just Spas, Just Swim Spas, LA Spas, Lanark Spas, Leisurite Spas, Maax Spas, Monarch Spas, MySpa, O2 Spas, Oasis, Sapphire Spas, Sapphire Swim Spas, SCS Spas, Signature Spas, Silver Spas, Spa Industries, Spa-Quip spas, SpaNet spas, Spas Direct, Sundance Spas, Sunrans, SwimEx, Trueform Spas, Tuff Spas, Urban Pool, Vortex®, Vortex® Swim Spas, and many others.

Handy PVC Plumbing Size Info
Plumbing sizes can be confusing. Pressure PVC pipe use nominal sizes - the size is simple a name, not the measured dimension. This convention is used across most pool and spa systems so that pipes and fittings remain compatible.
- 50mm / 2" = ~60-61mm OD
- 40mm / 1.5" = ~48mm OD
- 25mm / 1" = ~33-34mm OD

Plug Types & Styles
Common plug types found on spa equipment are AMP, Mini JJ, C38 (Aus 3-pin), Gecko in.link, etc.
To view plug types, click here.
- AMP plugs are the most common type used for over 20 years.
- Almost all Mini J&J plugs are no longer available and must be modified.
- C38 is the common Australian 3-pin plug found in normal household outlets.
- Gecko (Aeware) in.link style plugs are no longer available and must be modified.

General Information & Disclaimers

Many products we supply are OEM-supplied and may not include retail packaging, printed instructions, or accessories. Refer to the product listing for details, or contact us if unsure.

Product images are for illustration only. Actual items may vary due to manufacturer changes, updates, and other variations. Images may show a full assembly, a partial assembly, or a specific component only. They are provided for identification purposes and do not by themselves define what is included. Please read the title and description carefully.

All products must be installed and used by qualified and experienced persons in accordance with applicable Australian standards and manufacturer requirements. We are a parts supplier, similar to an electrical, plumbing, or automotive parts supplier. We sell parts, but cannot always provide exact installation, troubleshooting, or system design advice. Buyers are expected to know what they are doing or use a qualified professional.

® Trademark Information

All trademarks, brand names, and logos displayed on this website are the property of their respective owners. Heater & Spa Parts is an independent Australian supplier of replacement parts and accessories. Use of trademarked names, logos, and brands is for identification and compatibility purposes only, unless otherwise stated.