Davey Spaquip - Spa Power 750 / 1000 / 1200 Twin Element Heater Assembly - SP750 SP1000 SP1200

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3.4kW/3.5kW - Twin Element 4.5kW - Twin Element 5.5/6.0kW - Twin Element

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Davey Spa-Quip Spa Power 750 / 1000 / 1200 Twin-Element Heater Assembly - SP750 SP1000 SP1200

Electrician Required

These heaters must be installed and wired by a licensed electrician. Replacement heater assemblies no longer include the wiring looms shown in some product photographs, older manuals and wiring diagrams. Your electrician will need to reuse suitable existing wiring or manufacture new wiring looms where required.

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Stock available for dispatch from VIC, NSW, WA and QLD.

Genuine Davey Spa-Quip / Spa Power twin-element heater assemblies used with selected SP750, SP1000 and SP1200 spa control systems.

Available in 3.0kW / 3.5kW, 4.5kW and 5.5kW / 6.0kW twin-element configurations.

Twin-Element Heater Sizes & Part Numbers

Twin Element - 3.0kW / 3.5kW
Part Numbers: Q80046T / Q80064T / Q80064
Twin Element - 4.5kW
Part Numbers: Q80047T / Q80065T / Q80065
Twin Element - 5.5kW / 6.0kW
Part Numbers: Q80048T / Q80066T / Q80066

Single-Element Heaters

IMPORTANT: This listing is for TWIN-ELEMENT heater assemblies only. If your existing heater has a single heating element, do not order from this listing. Use the correct single-element heater below:

2.0kW Single-Element Heater: 15146-20 - Click here
3.0kW / 3.5kW Single-Element Heater: 15146-30 - Click here

Single-element heaters are not supplied from this listing. If your existing heater has only one heating element, use the appropriate product below:

Single Element - 2.0kW
Part Number: 15146-20 - View 2.0kW Single-Element Heater
Single Element - 3.0kW / 3.5kW
Part Number: 15146-30 - View 3.0kW / 3.5kW Single-Element Heater

Compatible Spa Power Controllers

These twin-element heaters are used across various versions of:

These systems may also be referred to as Davey SP750, SP1000 or SP1200.

Do not select a replacement heater based only on the controller model. Different versions of these controllers were produced with different heater configurations. Check whether your existing heater is single-element or twin-element, together with its kW rating and part number, before ordering.

Installation & Wiring - Important

Replacement of these heater assemblies requires a licensed electrician.

New heater assemblies do not come with wiring looms.
The wiring looms shown in some photographs, manuals and older Davey / Spa-Quip documentation are not included.
Your electrician may need to reuse suitable existing wiring or manufacture new wiring leads or looms to suit the controller.
All terminals and connections must be correctly sized, terminated and tightened.
Poor, loose or high-resistance electrical connections can overheat and damage the heater, wiring or controller.

SP750 / SP1000 wiring reference:
View SP750 / SP1000 heater wiring instructions.

These instructions are provided as a reference for your electrician. Older instructions may show wiring looms that are no longer supplied with replacement heater assemblies.

Single-Element Heater Installation Notes

The following information applies only where a separate single-element heater is being fitted:

The temperature sensor fitted to newer single-element heaters with the grey cable is not used by SP750 / SP1000 control systems.
The secondary Klixon high-limit circuit from the PCB may need to be looped depending on the installation.
Only one Klixon high-limit switch is required on the single-element heater arrangement.

Before Ordering

Please confirm the controller model, twin-element heater configuration, heater kW rating and existing part number before ordering.

If your existing heater is single-element, use the separate single-element heater links above.

Warranty

1-Year Return to Base Warranty. Warranty does not cover damage caused by corrosive water or incorrect water chemistry.

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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Q80064T / was Q80046T