Onga Balboa 2391 1.25HP w/ 1.3kW Heater - Heated Spa Bath Pump - B-23910100
Onga Balboa 2391 1.25HP w/ 1.3kW Heater - Heated Spa Bath Pump - B-23910100 is temporarily out of stock and will ship as soon as it's available.
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Warranty Information
Warranty Information
Onga Balboa 2391 1.25HP w/ 1.3kW Heater - Heated Spa Bath Pump - B-23910100 is temporarily out of stock and will ship as soon as it's available.
Onga Balboa 2391 1.25HP w/ 1.3kW Heater - Heated Spa Bath Pump - B-23910100
Onga Balboa 23910100 - 2391 Heated w/ Air Switch. Hot Spa Pump 1.25hp with 1.3kW (1300W) heater element. Made in the USA. Comes complete with unions and an in-built air switch. This pump will run approximately 5-8 jets. Originally were under the Onga brand, but now are Balboa. The pumps are the same.
- Physically Stocked, unlike most "drop-shipping" websites.
- Shipped from VIC, NSW, WA, QLD
Balboa spa bath pumps are one of the quietest in the industry. They offer maximum energy efficiency for lower operating costs, as well as no water retention for perfect hygiene, water resistant enclosures, and multiple levels of safety for your peace of mind.
The Balboa Pumps provide excellent hydraulic performance in a compact and extremely quiet design. Designed to circulate hot water in (whirlpool) spa baths, not spas, these pumps incorporate a special internal design to ensure the pump self drains eliminating the build up of unhygienic/stale water.
Hydromassage Hot spa pump with unions and Air Switch.
Specifications:
- Maximum total head: 13.5m
- IP Rating: IP55
- Inlet and outlet: 40mm PVC Pressure Barrel Union
- Maximum Ambient Temperature: 55°C
- Maximum Water Temperature: 70°C (capable of pumping 70°C, but not recommended for spa bath use)
- Primary heating temperature cut-out: 40°C
- Secondary "safety" heater cut-out: 45°C
- Noise: 65 dBa at 1 metre
- For Spa Bath use only
- Balboa Bath Pump Instruction Manual
- Installation Manual & Diagrams
More Info:
- 220-240V
- Compact Design
- Highly efficient motor
- Self draining Volute
- TEFC IPX5 Design
- AU / NZ Certification
- Quiet Operation
Pump size: (not including unions)
H:23 x L: 36 x W: 17cm
Installation Notes:
- Read the Balboa Bath Pump Instruction Manual (PDF) before you start. The notes below are a summary of the key points only.
- For spa bath use only where it is drained after use. Not for standalone spas, permanently-filled spas, chemically-treated water, or any other application.
- Not self-priming. The casing has to be flooded before starting, so the pump suction inlet must sit higher than the bath suction fitting.
- Mount it solid, level, rigid and vibration free, and bolt the pump down to reduce vibration and pipe stress.
- Allow at least 102cm clearance for motor ventilation. Without it the motor overheats and the pump stops.
- The fittings are ABS. Some PVC jointing compounds are not compatible with ABS, so check the solvent cement before gluing.
- Barrel unions are hand tight only. No wrenches, no thread tape, no pipe compound.
- Keep it out of the weather. A protective cover is required if the pump is installed outside.
- Runs from a dedicated 10 Amp power socket. An earth leakage or residual current device must be fitted.
- 6 metres of non-kink air tube is supplied for the air button connection.
Operation:
- Fill the bath to at least 50mm above the jets before switching on. Never run the pump dry.
- Press the air button to start. Press it again to stop.
- Fill with cold to lukewarm water. Water already above 40°C can leave the heating element inactive, and the over-temperature sensor can trip while the bath is filling.
- The heater only operates while the pump is running at normal operating pressure. A built-in pressure sensor stops the element working without flow.
- A pre-set thermostat holds the water to a maximum of 40°C, interlocked to a secondary upper limit cut-out.
Warranty: Covered by our Warranty Policy.
Specifications taken from the Balboa Water Group 200 Series Mechanical Hydromassage Pumps owner's manual, document 40693 Rev D.
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 Dimensions1.
- 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.
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).
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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