Universal Laing Heater - 2.7kW LA Spas and Others
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Delivery and Shipping Info*
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Universal Laing Heater - 2.7kW LA Spas and Others
2.7kw circulation style universal titanium heater replacement with threaded pressure switch tap (pressure switch sold seperately) to suit Gecko Electronics SSPA, MSPA-MP spa packs and many other circulation heater applications. aka Trombone style heater.
Important: Can be used to replace similar discontinued heaters in varying shapes and kilowatt ratings from 2.0-5.2kw in most applications where the power supply permits. If you are replacing a heater that was originally less than 2.7kW confirm with your electrician the power circuit will allow the extra wattage.
Includes:
- Internal mechanical thermal hi limit
- Pressure switch tap (fitted with threaded plug). A pressure switch can be fitted.
More Info:
- Can be used with in-line flow switch or a pressure switch can be threaded in.
- 3/4" barbed connections for clear tubing
- Can be used on LA Spas, Heritage Spas, Lanark Spas, Southwest Spas, Sierra Spas, Sundance Spas, Jacuzzi Hot Tubs and many others
- Can be used to replace Gecko MSPA-MP heaters if a remote hi-limit is fitted/soldered to pcb if existing high-limit is in a foam poron strap.
- C3478-1A, 6500-401, SEH-2700-NHC, L6697, 01563-0031, 01564-34-A, C3550-1, SHH-5500-NH-6871, SHH-5200-NH-6785, SHH-5500-NH-7328, SHH-5500-NH-6771, C3550-1, SHH-5200, SHH-5200-NH, SX tpc3478-1A / HQ-26-3236-2A-BT-K
- 2.7kw, 230v
-
Original heater power supply cord will need to be re-used / wired to heater terminal box.
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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tpc3478-1A / HQ-26-3236-2c-BT-K