4.0kW 10" Universal Heater Element - Balboa Hydroquip Pentair
4.0kW 10" Universal Heater Element - Balboa Hydroquip Pentair is backordered and will ship as soon as it is back in stock.
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Don't Guess - Ask Us!
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Delivery and Shipping Info*
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4.0kW 10" Universal Heater Element - Balboa Hydroquip Pentair
4.0kW 10" Universal Heater Element - Balboa Hydroquip Pentair is backordered and will ship as soon as it is back in stock.
Universal Balboa, Hydroquip, Pentair Heater element. 4.0kW. Suits 15" and other sizes of heater assemblies. Fits all Balboa M7 / GS / VS / GL / EL / Dominator / BP / Sig10, Sig15 series. Also suits many Gecko, Hydroquip, Pentair and other brands. These are common on Signature, Leisurite, Bullfrog, Designer, Lanark, and many more.
Suits all Twin-Sensor M7 & non-m7 Balboa Systems, with, or without pressure switch.
New style has epoxy bulkheads to considerably reduce galvanic corrosion where the element penetrates the heater tube. First image shows the more common older style elements.
Specifications:
- Material: Incoloy w/ SS hardware & epoxy bulkhead
- Terminal Nut: 3/8"
- Base Stud: 1/4" - Approx 32mm Centre-to-Centre studs.
- Power: 4000W (~17A)
Other Parts:
- Balboa Heater Seals
- Balboa Heater Wrench
Notes:
- Make sure when loosening and tightening element nuts, that the base stud nut is held firmly, with no movement. If the base stud nut is twisted, it damages the epoxy seal and element, and cannot be covered by warranty.
- Base stud nuts use with 3/8", or 1/4" slimline spanners. (not metric)
- We recommend replacing the heater gaskets when replacing the heater elements
In plumbing, named sizes are not the actual measurements. A pipe called “50mm” or “2"” does not measure 50 mm across. Instead, it follows nominal sizing, an internationally-standardised naming system.
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 |
These are nominal sizes and are designed to fit matching fittings — not to measure exactly 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 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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