SpaNET SV2, SV3, SV4 V2 Heaters - Variable Output Heater Assemblies - 3000w, 5500w, 6000w
SpaNET SV2, SV3, SV4 V2 Heaters - Variable Output Heater Assemblies - 3000w, 5500w, 6000w - is temporarily out of stock and will ship as soon as it's available.
Don't Guess - Ask Us!
Don't Guess - Ask Us!
Not sure if it’s the right part? Send us a message and a photo of what you’re replacing, or what you need, and we’ll help make sure you get the right part the first time.
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Delivery and Shipping Info*
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SpaNET SV2, SV3, SV4 V2 Heaters - Variable Output Heater Assemblies...
SpaNET SV2, SV3, SV4 V2 Heaters - Variable Output Heater Assemblies - 3000w, 5500w, 6000w - is temporarily out of stock and will ship as soon as it's available.
SpaNET SV2/ SV3 / SV4 Complete Heater Assembly: V2 Models 3000w, 5500w, 6000w
Physically stocked in Australia, not simply listed for drop-shipping.
Dispatched from VIC, NSW, WA and QLD.
Important: This heater suits V2 systems only.
V1 heaters are discontinued and are no longer available. A V2 heater cannot be installed into a V1 SpaNET control box. If your system is V1, the control box and heater will need to be upgraded.
See second image for how to identify whether you have a V1 or V2 heater, as well as to confirm the heater size.
Spanet control systems may be rebranded by Vortex®, SpaPro, WWDG, etc. Check control box underneath the spa for the Spanet name.
Complete Heater Assembly
This is the complete SpaNET SV heater assembly, supplied with the heater element and the components used by the controller to detect water, monitor temperature and operate the heater safely.
- Stainless steel heater tube and integrated heater element
- Optical water sensor
- Heater temperature sensors
- Thermal protection components
- Sensor and power wiring loom
Standalone heater elements are not sold separately.
Faults This Heater Assembly May Resolve
Replacement of the complete heater assembly can resolve SpaNET faults caused by failed, corroded or inaccurate heater sensors, optical water detection problems, damaged wiring or internal heater assembly faults.
Common symptoms and error codes include:
- Incorrect, unstable or unrealistic water-temperature readings
- Temperature readings showing 99.7°C or 99.9°C
- ER-2: Heater sensor or heater plug fault
- ER-3: Water-prime or optical water-sensor fault
- ER-4: Heater thermal-trip fault
- ER-5: Pool-too-hot or incorrect temperature-sensor reading
- ER-6: Loss of communication between the heater assembly and control box
- Other water-detection or incorrect-temperature faults originating within the heater assembly
Important diagnostic note: ER-3 and ER-4 can also be caused by low spa water level, dirty filters, airlocks, closed valves, restricted pipework, a circulation-pump problem or otherwise inadequate water flow. These conditions should be checked before replacing the heater.
Why We Recommend Replacing the Complete Assembly
Individual replacement heater sensors are available in some cases. However, we generally recommend replacing the complete heater assembly rather than replacing the sensors alone.
Heater sensors commonly fail after corrosion, moisture ingress or deterioration within the heater assembly. Replacing only the failed sensor does not address the condition of the remaining sensors, heater tube, wiring, seals, electrical connections or heating element.
In many cases, replacing the sensors alone results in another fault developing and the complete heater assembly still needing to be replaced. Replacing the complete assembly provides a more thorough and reliable repair.
Confirm That You Have a V2 Heater
Do not select the heater from the controller model alone. SpaNET SV2, SV3 and SV4 control systems have been produced with different heater versions and power ratings.
- Locate the serial-number label on the front of the SpaNET control box.
- If the serial number ends in V2, the controller uses a V2 heater.
- If the serial number does not show a V number, it is normally a V1 controller.
- Check the heater power rating shown on the control-box or heater data label.
V1 heaters are no longer available. A V1 system must be upgraded using a compatible SpaNET control box and heater package .
Visual V1 and V2 Identification
The heater itself can also be inspected:
- V2 heater: Two Triacs are fitted to the heater assembly. These are small electronic components normally covered with white silicone.
- V1 heater: One Triac is fitted and normally covered with white silicone.
If the label and visual identification do not agree, contact us before ordering.
Compatibility and Heater Sizes
| Heater Version | Power Rating | Compatible Controllers | Availability |
|---|---|---|---|
| SV V2 | 3.0 kW | SV2 | Available |
| SV V2 | 5.25, 5.5 or 6.0 kW | SV2, SV3 and SV4 | Available |
| SV V1 | 3.0 kW | Usually found in SV2 controllers | No longer available. Replace the control box . |
| SV V1 | Approximately 5.0 to 6.0 kW | SV2, SV3 and SV4 | No longer available. Replace the control box . |
Before Ordering
- Confirm that the controller serial number identifies it as a V2 system.
- Confirm the required heater power rating from the data label.
- Do not attempt to install a V2 heater into a V1 control box.
- Check for water-flow problems before assuming an ER-3 or ER-4 code is caused by the heater.
- Ensure you are ordering the correct part before installation.
Unions and Installation
Heater unions are not included. Some product images may show unions for identification or reference purposes only.
Installation and electrical connection must be completed by a suitably qualified electrician, pool technician or spa technician. Power must be isolated before the control box or heater connections are accessed.
Need Help Confirming the Correct Heater?
Email us a clear photo of the control-box data label, the complete serial number and a photo of the existing heater. We can use this information to help confirm the heater version and power rating before you order.
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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SN-SV-V2-HTR-55
