3.0kW - 10" Universal Spa Heater Element - 32mm Across Studs - Balboa and Others

$125.00 $195.00

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Incoloy 3.0kW Element - 10" Titanium 3.0kW Element - 10"

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3.0kW Universal Spa Heater Element – Titanium or Incoloy

High-quality 3.0kW replacement spa heater element, available in Titanium or Incoloy. Suits a wide range of spa models and brands. Designed to fit 15" and other heater assemblies with element studs approximately 32mm centre-to-centre.

Compatible With

All Balboa M7 and non-M7 control systems, including:
GS, VS, GL, EL, BP, Dominator, Sig10, Sig15
Many models from: Balboa, Gecko, Hydroquip, Pentair and others
Commonly used in spa brands like: Signature, Leisurite, Bullfrog, Designer, Lanark and more

Upgrade Option

Most spa controllers come standard with an Incoloy element. Upgrade to Titanium for better corrosion resistance and longer service life.

Replaces Heater Elements In

All Balboa GS, VS, EL, and other series controllers
Suits twin-sensor M7 and non-M7 systems (with or without pressure switch)
Also compatible with approx. 330mm length LX heater elements.
Note: Does not fit 250mm heater tubes!

Specifications

Material: Titanium or Incoloy element with stainless steel hardware
Terminal Nut: Stainless steel 3/8"
Base Studs: Stainless steel or titanium 1/4"
Stud Distance: Approx. 32mm centre-to-centre

Installation Notes

When tightening terminal nuts, always hold the base stud nut firmly to avoid damaging the epoxy seal. Damage caused this way is not covered under warranty.
Use 3/8" or 1/4" slimline (Imperial) tools. Metric tools may damage the nuts and studs.
We recommend replacing the heater gaskets when installing a new element.

Compatible Part Numbers Include

53475, 53475-01, 53883, 53883-01, 53883-02, 53883-03, 53883-04, 53885, 53885-01, 53885-02, 53885-03, 53885-04, 53996, 54282, 54282-01, 54282-02, 54282-03, 54282-04, 54297, 54297-01, 54297-02, 54297-03, 54305, 54305-01, 54305-02, 54346, 54406, 54476, 54476-01, 54479, 54479-01, 54479-02, 54501, 54501-01, 54503, 54503-01, 54699, 54705, 54850, 54850-01, 55085, 55085-01, 55087, 55087-01, 55496, 55496-01, 55565, 55595, 55595-01, 55626, 55866, 55866-01, 55890, 56002, 56002-01, 56002-02, 56002-03, 56002-04, 56004, 56004-01, 56012, 56012-01, 56012-02, 56220, 56282, 56290, 56290-01, 58061, 58107, 58118, 58215, 58300, 58301 and more.

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"	25 mm	~33.4–33.7 mm
1.5"	40 mm	~48.1–48.4 mm
2"	50 mm	~60.2–60.5 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.

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.

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).

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.

PVC Pressure Pipe AS/NZ 1477 Dimensions¹:

Common nominal sizes with typical outside diameters and indicative inside diameters by class.

Imperial Name	Metric Name	Outside Diameter (OD)	Class 9 IDº	Class 12 IDº	Class 18 IDº
1/2"	15 mm	~21.2–21.5 mm		18.3 mm	17.8 mm
3/4"	20 mm	~26.6–26.9 mm		23.7 mm	22.4 mm
1"	25 mm	~33.4–33.7 mm	30.5 mm	29.8 mm	28.1 mm
	32 mm	~42.1–42.4 mm	38.5 mm	37.5 mm	35.4 mm
1.5"	40 mm	~48.1–48.4 mm	45.2 mm	44.1 mm	42.8 mm
2"	50 mm	~60.2–60.5 mm	55.2 mm	53.7 mm	50.5 mm
	65 mm	~75.2–75.5 mm	68.9 mm	67.0 mm	63.2 mm
2.5"		~73 mm

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.

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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