Balboa 3.0kW M7 Heater Assembly - 3kW M7 - Titanium
Balboa 3.0kW M7 Heater Assembly - 3kW M7 - Titanium is backordered and will ship as soon as it is back in stock.
Delivery and Shipping
Delivery and Shipping
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Genuine Titanium 3.0kW Balboa Instruments & Balboa Water Group heater assembly for all GS, VS, EL, GS, BP, Dominator series (and many other) spa controllers. Available in standard Incoloy or Titanium versions. Replaces B-58118, B-55626, B-58301 and others - See list below. As of late 2023, comes with the new easier-to-install Plug n Click system.
- Genuine Balboa product - now with 'Plug n Click' as of 2023. We note others are passing others off as "Genuine." We are an authorised Balboa dealer.
- Available in standard Incoloy or upgraded Titanium here
- Shipped Fast from NSW, VIC, QLD, WA
- Can be picked up
Important - Please Read:
- As of 2023 new M7 Balboa heaters come with an attached Balboa Plug n Click lead as per photo. Older spa controllers that still have the copper heater connections will need the Balboa Plug n Click Adaptor (see Add-Ons). The Plug n Click adaptor replaces the old copper connections for an easier-to-fit heater replacement.
- We have noted some online sellers are removing the Plug n Click leads. Failure to use the Plug n Click system will result in a rejection of warranty from Balboa.
- Length: 381mm or 15"
- Diameter: 57mm or 2.25" (referred to as 2")
- Product supplied may vary slightly from pictures.
- Damage to heater studs is not covered by warranty.
Suits all Twin-Sensor M7 Balboa Systems without pressure switch. This the most most common spa heater since the 2000s. Used by Spa Industries, Signature, Cyclone, Leisurite, Bullfrog, Designer, H2O, LA Spas, USA Spas, Spas Direct, and many others.
- 2 x sensor mounts - suits twin sensor M7 systems. Also suits Dominator, BP, GS, GS501, GS501Z, GL, BFBP, ES, GS series and many others. See list below.
- Comes with heater tube, heater element, and twin sensors
Replaces the following part numbers:
53475, 53475, 53475-01, 53883, 53883-01, 53883-02, 53475-01, 53883-03, 53883-04, 53885, 53885-01, 53885-0253883, 53885-03, 53885-04, 53996, 54282, 54282-01, 53883-01, 54282-02, 54282-03, 54282-04, 54297, 54297-01, 53883-02, 54297-02, 54297-03, 54305, 54305-01, 54305-02, 53883-03, 54346, 54346-01, 54406, 54476, 54476-01, 53883-04, 54479, 54479-01, 54479-02, 54501, 54501-01, 53885, 54503, 54503-01, 54699, 54705, 54850, 53885-01, 54850-01, 55085, 55085-01, 55087, 55087-01, 53885-02, 55496, 55496-01, 55565, 55595, 55595-01, 53885-03, 55866, 55866-01, 55890, 56002, 56002-01, 53885-04, 56002-02, 56002-03, 56002-04, 56004, 56004-01, 53996, 56012, 56012-01, 56012-02, 56220, 56282, 54282, 56290, 56290-01, 58061, 58118, 58215, 58107, 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.
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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