Genuine Balboa 3.0kW M7 Heater Assembly - Updated Version - 3kW M7
Genuine Balboa 3.0kW M7 Heater Assembly - Updated Version - 3kW M7 - is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Balboa 3.0kW M7 Heater Assembly – Updated 2024 Version supersedes and retrofits the older style with Copper L-shaped Connectors.
Genuine 2024+ version of the Balboa 3.0kW M7 heater assembly. Replaces all older M7-style 3.0kW heaters. Compatible with GS 501, VS 500, EL, BP, Dominator series, and other Balboa spa control systems.
Fast Shipping or Pickup
2024 Update – Plug n Click System - Now features Balboa's updated Plug n Click system for simplified, faster, and safer installation:
- Replaces older version with copper terminal connectors
- Includes Plug n Click lead and adaptor
- Installation: Remove 3/8" stainless steel nuts from the control board, attach new ring terminals, refit nuts, and connect the loom
- Reduces risk of improper installation and improves serviceability for future replacements
Kit Options
Full Kit Includes (if you don't have the plug style connector):
- Balboa M7 3.0kW heater assembly
- 2 x Balboa M7 temperature sensors ( with 12/14" leads)
- Plug n Click lead
- Plug n Click adaptor - Replaces the L-shaped copper connectors.
- Heater gasket seals
Heater Only with Half Loom:
- For systems already using the Plug n Click adaptor
- Includes heater, 2 x M7 sensors, and Plug n Click lead.
Specifications
- Model: HEATER 3.0KW 15" 2X2" M7 STUD – Balboa Instruments
- Length: 381mm (15")Tube
- Diameter: 57mm (2.25"), referred to as 2"
- Heating Element: 3.0kW
- 2 x sensor mounts – suits twin-sensor M7 systems (no pressure switch)
- Compatible with GS, VS, EL, BP, Dominator, GL, ES, BFBP series and others
Installation Notes
Connections must be properly tightened—failure to do so may cause overheating or damage, which is not covered by warranty
Some sellers remove or modify the Plug n Click loom; doing so may void Balboa warranty
Compatibility - Used widely in systems from:
- Spa Industries, Signature, Cyclone, Leisurite, Bullfrog, Designer Spas, H2O, LA Spas, USA Spas, Spas Direct, Many others
Replaces the Following Part Numbers
53475, 53883, 53885, 53996, 54282, 54297, 54305, 54346, 54406, 54476, 54479, 54501, 54503, 54699, 54705, 54850, 55085, 55087, 55496, 55565, 55595, 55626, 55866, 55890, 56002, 56004, 56012, 56220, 56282, 56290, 58061, 58107, 58118, 58118KIT1, 58215, 58300, 58301, and others.
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.
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).
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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