🛁 Laing E10 Spa Circulation Pump — 1/40 HP 230V 3/4″ Barb | 73979

Energy-efficient 230V ECM circulation for the widest range of full-size hot tubs and spas

📋 Product Overview

The Laing E10 (73979) is a 230V, single-speed circulation pump with 3/4″ barb connections — the most widely used 230V E10 variant because the majority of spa circulation systems use 3/4″ vinyl tubing. This is the universal generic version of the same pump sold under the Sundance OEM designation LHB07100138, and it replaces the Sundance/Jacuzzi 6000-125 (which includes a mounting frame — this 73979 is the standalone pump only). Built with the same high-efficiency Electronically Commutated (EC) permanent magnet spherical motor found across all E10 models, the 230V version draws just 71 watts at 3,200 RPM while consuming 40% less energy than the SM-909 and SM-1212 induction motor pumps it replaces. The patented sealless, shaftless design uses a magnetically driven open impeller with a high-density ceramic ball bearing and graphite impeller bearing cap — there is no mechanical seal to leak, wear, or replace. Built-in dry run protection via an embedded microprocessor automatically shuts the pump down if no water is detected, while automatic overload protection and soft start further safeguard the motor. Delivering up to 15 GPM with a maximum head of 20 feet and maximum working pressure of 50 PSI, this pump handles the circulation demands of virtually any spa. Operating at less than 40 dB, weighing less than 5 lbs, and featuring an integrated rotatable bracket with 4 discharge positions, the 73979 fits even the tightest equipment bays. Includes a 4-foot power cord and mounting bracket. Used as OEM equipment in Dimension One, Dynasty, Gatsby Spas, Jacuzzi, Saratoga, Sundance, and Santa Barbara Spas, and confirmed compatible with Cal Spa, Vita Spa, Watkins, and many others.

⚠️ 230V ONLY: This pump operates on 230V power. Do NOT connect to a 115V circuit. Verify the voltage on your existing pump label before ordering. For 115V spa systems with 3/4″ barb connections, use the 73989 (115V, 3/4″ barb) instead.

💡 73979 vs. LHB07100138 vs. 6000-125: These are all the same Laing E10 pump at 230V with 3/4″ barb connections. The 73979 is the generic Laing part number. The LHB07100138 is the Sundance OEM designation. The 6000-125 includes this pump pre-mounted to a Sundance/Jacuzzi mounting frame at 90 degrees — if you only need the pump, the 73979 is the correct choice.

⭐ Key Features

✅ 230V Operation — Standard voltage for most full-size hot tubs — the most common 230V E10 variant

✅ 3/4″ Barb Connections — Fits the majority of spa circulation systems using 3/4″ ID vinyl tubing

✅ ECM Permanent Magnet Motor — 71 watts at 3,200 RPM — 40% less energy than SM-909/SM-1212

✅ Sealless, Shaftless, Leak-Proof — Patented magnetically driven design — no mechanical seal to fail

✅ 15 GPM / 20 ft Max Head / 50 PSI — Handles demanding circulation requirements

✅ Dry Run Protection — Embedded microprocessor auto-shutdown — prevents damage if run without water

✅ Whisper-Quiet — Less than 40 dB — virtually silent 24/7 continuous operation

✅ Rotatable Bracket — 4 Positions — Integrated thermoplastic bracket adapts to any plumbing layout

✅ Automatic Overload Protection — Built-in motor protection against electrical overload

✅ 90% Heat Transfer — Motor heat transferred into spa water, not wasted to air

✅ 4′ Power Cord & Mounting Bracket Included — Ready to install out of the box

✅ 1-Year Manufacturer’s Warranty — Full warranty coverage

🔩 Technical specifications

⚡ Electrical Requirements

115V vs. 230V E10 Motor Comparison

Specification	115V E10 (73989)	230V E10 (THIS PUMP)
Input Wattage	62W	71W
RPM	3,100	3,200
Flow Rate (Max)	15 GPM	15 GPM
Max Head	20 ft	20 ft

💡 The 230V version runs at slightly higher RPM (3,200 vs 3,100) and draws slightly more wattage (71W vs 62W), but flow rate and head pressure are the same across both voltage versions.

⚠️ CRITICAL: This is a 230V pump ONLY. For 115V spa systems, use the 73989 (115V, 3/4″ barb). Always verify voltage on your existing pump label before ordering. Using a 230V pump on 115V will result in poor performance; using a 115V pump on 230V will damage the motor.

⚠️ ELECTRICAL SAFETY: All electrical installations must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local building codes. Hot tubs require GFCI (Ground-Fault Circuit Interrupter) protection. A dedicated circuit is required — do not share with other appliances.

🔄 Compatibility Guide

Compatible Spa Brands — Confirmed

Brand	Compatibility	Notes
Sundance Spas	✅ Confirmed — OEM	Same pump as LHB07100138 / 6000-125 (pump only, without frame)
Jacuzzi	✅ Confirmed — OEM	J-200 and J-300 series 230V (2002–2011+)
Dimension One (D1)	✅ Confirmed	230V models with 3/4″ barb; replaces 01512-320E (without flow switch)
Dynasty Spas	✅ Confirmed	—
Gatsby Spas	✅ Confirmed	—
Saratoga Spas	✅ Confirmed	—
Santa Barbara Spas	✅ Confirmed	—
Vita Spa	✅ Confirmed	Replaces 0420444 H.E.E.T. pump assembly (retro-fit)
Watkins (Hot Springs / Caldera)	✅ Confirmed	230V models with 3/4″ barb
Cal Spa	✅ Customer confirmed	Direct fit
Any 230V spa with 3/4″ barb circ pump	✅ Universal fit	Same voltage and connection type

SM-909 / SM-959 / SM-1212 Replacement Guide (230V, 3/4″ Barb)

The 73979 replaces all discontinued 230V SM-909, SM-959, and SM-1212 series pumps with 3/4″ barb connections:

Old Model	Part Number	Flow Rate	Replaced By
SM-909-NHW-14	6509	6 GPM	✅ 73979 (15 GPM — significant upgrade)
SM-909-NHW-18	6921	11 GPM	✅ 73979 (15 GPM)
SM-909-NHW-26	6920	9.5 GPM	✅ 73979 (15 GPM)
SM-959-NHW-26	7065	—	✅ 73979
SM-1212-NHW-26	6975	12 GPM	✅ 73979 (15 GPM)

💡 All SM-909/SM-959/SM-1212 models have been permanently discontinued. The Laing E10 is the official factory replacement with higher flow rates and 40% lower energy consumption.

73979 vs. LHB07100138 vs. 6000-125

Part Number	What It Is	Pump Included	Mounting Frame	Notes
73979	Generic Laing part number	✅ Yes — THIS PUMP	❌ No — pump only	Universal replacement for any 230V 3/4″ barb spa
LHB07100138	Sundance OEM designation	✅ Yes — same pump	❌ No — pump only	Same as 73979 under different part number
6000-125	Sundance/Jacuzzi OEM assembly	✅ Yes — same pump	✅ Yes — includes frame	Pump pre-mounted at 90° on Sundance/Jacuzzi frame
6500-035	Older Sundance 230V designation	Discontinued — replaced by 73979	—	Legacy part number

⚠️ Sundance/Jacuzzi Owners: If your existing pump is mounted on a Sundance/Jacuzzi frame bracket and you want the complete assembly (pump + frame), order the 6000-125 instead. If you only need the pump itself (your frame is still good), the 73979 is the correct — and typically more affordable — choice.

Plumbing Compatibility — Connection Type Is Critical

Your Existing Connection	This Pump	Notes
3/4″ barb	✅ Direct fit	3/4″ barbed intake and discharge — connects to 3/4″ ID vinyl tubing
1″ barb	❌ Wrong size	Use 74079 (230V, 1″ barb) instead
3/4″ MPT (threaded)	❌ Wrong type	Use 73999 (230V, 3/4″ MPT) instead
1-1/2″ MBT threaded	❌ Wrong size/type	Different connection type entirely

Laing E10 Family — All Voltage & Connection Variants

Part Number	Voltage	Connection	Notes
73979	230V	3/4″ Barb	✅ THIS PUMP
LHB07100138	230V	3/4″ Barb	Same pump — Sundance OEM designation
74079	230V	1″ Barb	230V, larger barb connections
73999	230V	3/4″ MPT (threaded)	230V, threaded connections
73989	115V	3/4″ Barb	115V version of this pump
6500-460	115V	3/4″ Barb	Same as 73989 — Sundance/Jacuzzi 115V OEM
74069	115V	1″ Barb	115V, larger barb connections
74009	115V	3/4″ MPT (threaded)	115V, threaded connections

---

📐 Alternate Part Numbers

Primary Part Numbers

Part Number	Notes
73979	Laing primary part number (THIS PUMP)
6050U0016	Laing OEM manufacturer number
E10-NSHNDNN2W-02	Laing model number
E10-NSHNNN2W-20	Laing model revision
E10-NSHN2W-20	Laing model revision
E10-NSHNSW20	Laing model variant
LHB07100138	Laing catalog reference / Sundance OEM
733886739794	UPC / barcode

Sundance / Jacuzzi OEM Cross-References

Part Number	Notes
6000-125	Sundance/Jacuzzi OEM — INCLUDES mounting frame (pump + frame assembly)
6000-125E	Sundance/Jacuzzi OEM variant
SD6000-125	Sundance designation
6500-035	Older Sundance 230V part number
SD6500-035	Sundance designation
LHB07100138	Sundance OEM — pump only (same as 73979)
LHB7100138	Alternate format (without leading zero)

HydroQuip Cross-References

Part Number	Notes
10-0121	HydroQuip catalog number
10-0121-K	HydroQuip kit format
10-0121M-K	HydroQuip kit variant

Dimension One (D1) Cross-References

Part Number	Notes
01512-320E	D1 circ pump WITH built-in pressure switch (different variant — includes flow switch)
1512-320E	D1 alternate format

SM-909 / SM-959 / SM-1212 Replaced (230V, 3/4″ Barb)

Part Number	Notes
SM-909-NHW-14	230V, 3/4″ barb — replaced by 73979
SM-909-NHW-18	230V, 3/4″ barb — replaced by 73979
SM-909-NHW-26	230V, 3/4″ barb — replaced by 73979
SM-959-NHW-26	230V, 3/4″ barb — replaced by 73979
SM-1212-NHW-26	230V, 3/4″ barb — replaced by 73979
SM909NH-18-240	Combined format — 230V
SM909NH-240	Combined format — 230V

Laing Numeric Cross-References

Part Number	Notes
6509	SM-909-NH-14 (6 GPM)
6524	Laing numeric reference
6920	SM-909-NH-26 (9.5 GPM)
6921	SM-909-NH-18 (11 GPM)
6975	SM-1212-NH-26 (12 GPM)
69750	Variant format
7065	SM-959-NH-26
9337-0	Laing catalog number
9338-01	Laing catalog number
9338-11	Laing catalog number
9339-08	Laing catalog number
9339-16	Laing catalog number
9375	Laing catalog number

Combined Format Cross-References

Part Number	Notes
LAISM909NH14/23	SM-909-NH-14, 230V
LAISM909NH18342	SM-909-NH-18, 230V
LAISM909NH26240	SM-909-NH-26, 230V
LAISM1212NH2634	SM-1212-NH-26, 230V

Industry / Distributor Cross-References

Part Number	Notes
1-00-0174A	Industry reference
1-00-0174	Industry reference
1-00-0098	Industry reference
1-00-0159	Industry reference
1-00-0168	Industry reference
1-00-0178	Industry reference
1-00-0198	Newer Laing reference
LAI-10-117	Distributor reference
389826	Distributor/OEM reference
297247679	Distributor reference
6619	Newer Laing reference
6316.9	Laing reference

UPC / Barcode Cross-References

Part Number	Notes
733886739794	Primary UPC
733886650907	UPC variant
733886692006	UPC variant
733886692105	UPC variant
733886697506	UPC variant

Brand-Specific Cross-References

Part Number	Brand	Notes
0420444	Vita Spa	H.E.E.T. pump retro-fit (230V E10)
30420444	Vita Spa	Alternate format

Grundfos Replacement Alternative

Part Number	Notes
10-0138-KIT	Grundfos universal kit (230V) — barb connections with adapters

LX Lower-Cost Alternative

Part Number	Notes
WE10-240	LX brand 230V equivalent — verify connection size before ordering

---

🛠️ Installation Requirements

What’s in the Box

Item	Included	Notes
Laing E10 circulation pump	✅ Yes	Complete pump assembly with integrated bracket
4′ (48″) power cord	✅ Yes	Bare cord
Mounting bracket	✅ Yes	Integrated thermoplastic — 4 discharge angle positions
Sundance/Jacuzzi mounting frame	❌ No	For frame assembly, order 6000-125 instead

Mounting

Requirement	Specification
Mounting Position	Horizontal OR vertical (motor end down ONLY)
Mounting Method	Integrated bracket — rotatable to 4 discharge positions
Do NOT Mount	Motor end UP — only horizontal or motor end down
Access	Allow clearance for cord connections and maintenance

Plumbing

Connection	Size	Notes
Intake (suction)	3/4″ barb (center suction)	Connects to 3/4″ ID vinyl tubing
Discharge	3/4″ barb (side discharge)	Connects to 3/4″ ID vinyl tubing
Tubing	3/4″ ID vinyl tubing	Secure with hose clamps

Installation Notes

⚠️ Verify Voltage FIRST: This pump operates on 230V ONLY. Check the label on your existing pump. For 115V systems, use the 73989 (115V, 3/4″ barb).

⚠️ Bracket Orientation: The integrated bracket mounts at 4 different discharge angles. Rotate to align with your existing plumbing before securing.

⚠️ First Startup: Soft start (approximately 3 seconds). The impeller may rotate slowly at first until water penetrates the bearings — this is normal.

⚠️ Dry Run Protection: If pump detects no water, it shuts down automatically. Repeated cycling indicates air lock or plumbing obstruction — check plumbing connections.

⚠️ Motor Orientation: Horizontal or vertical with motor end DOWN only. Never mount motor end up.

⚠️ Maximum Water Temperature: 140°F (60°C). Do not exceed.

⚠️ Wiring Note (Vita Spa owners): If replacing a Vita Spa 0420444 H.E.E.T. pump, you may need to splice wires from the new pump cord to your existing harness connector. Follow instructions included with the pump.

⚠️ GFCI Protection Required: All spa installations require GFCI protection per the NEC.

⚠️ Bonding & Grounding Required: Per NEC requirements.

---

⚙️ Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for water flow	Monthly	Verify circulation is active
Inspect barb connections	Monthly	Check for leaks at hose clamp connections
Listen for unusual noise	Monthly	Should be nearly silent (less than 40 dB)
Inspect cord and connections	Quarterly	Check cord condition and terminations
Check mounting bracket	Quarterly	Ensure pump is secure
Verify GFCI operation	Monthly	Press test button to check

Warning Signs — Replace Pump If:

• Pump fails to start or hums without rotation
• Unusual noise (clicking, grinding, buzzing)
• No water circulation despite pump running
• Motor trips breaker or GFCI repeatedly
• Pump vibrating excessively
• Dry run protection cycling repeatedly (if plumbing is clear, pump may need replacement)
• Error codes on spa controller related to circulation (FL1, FLO, etc.)

Sealless Design Advantage

The Laing E10’s patented sealless, shaftless design means there is no mechanical shaft seal — the most common failure point in traditional circulation pumps. The magnetically driven impeller eliminates this leak path entirely. If water appears at this pump, check hose clamp connections and barb fittings first — it is not a seal leak.

---

🎯 Ideal Applications

Application	Suitability	Notes
♨️ 230V spa with 3/4″ barb circ pump	✅ Yes — Primary use	Direct fit for the most common spa plumbing configuration
♨️ Sundance/Jacuzzi 230V circ pump	✅ Yes — OEM	Same as LHB07100138; replaces 6000-125 (pump only, without frame)
♨️ Jacuzzi J-200/J-300 230V (2002–2011+)	✅ Yes — Confirmed	—
♨️ Dimension One circ pump	✅ Yes — Confirmed	230V models; replaces 01512-320E (without flow switch)
♨️ Dynasty Spas circ pump	✅ Yes — Confirmed	—
♨️ Gatsby / Saratoga circ pump	✅ Yes — Confirmed	—
♨️ Vita Spa H.E.E.T. replacement	✅ Yes — Confirmed	Replaces 0420444 (retro-fit for Waterway Tiny Might)
♨️ Cal Spa 230V circ pump	✅ Yes — Customer confirmed	—
♨️ SM-909/SM-959/SM-1212 230V replacement	✅ Yes — Direct upgrade	All 230V NHW models with 3/4″ barb connections
♨️ Low-flow heater circulation	✅ Yes — Designed for	Maintains flow through heater assembly
♨️ Ozone treatment circulation	✅ Yes — Designed for	—
♨️ 115V spa systems	❌ No — Wrong voltage	Use 73989 (115V, 3/4″ barb)
♨️ Spas with 1″ barb connections	❌ No — Wrong size	Use 74079 (230V, 1″ barb)
♨️ Spas with 3/4″ MPT threaded	❌ No — Wrong type	Use 73999 (230V, 3/4″ MPT)

---

❓ Frequently Asked Questions

Q: What is the difference between 73979 and LHB07100138? A: They are the exact same pump. The 73979 is the generic Laing part number. The LHB07100138 is the Sundance OEM designation. Fully interchangeable.

Q: What is the difference between 73979 and 6000-125? A: The 6000-125 is this same pump pre-mounted on a Sundance/Jacuzzi mounting frame at a 90-degree angle. If you only need the pump (your frame is still good), order the 73979. If you need the complete pump + frame assembly, order the 6000-125.

Q: What is the difference between 73979 and 73989? A: The only difference is voltage. The 73979 operates on 230V (this pump). The 73989 operates on 115V. Both have 3/4″ barb connections. Always verify your spa voltage before ordering.

Q: What spas use this pump? A: The 73979 is used in Sundance, Jacuzzi (J-200/J-300 series 2002–2011+), Dimension One, Dynasty, Gatsby, Saratoga, Santa Barbara, Vita Spa, Watkins (Hot Springs/Caldera), Cal Spa, and many other brands. It fits any spa using a 230V circulation pump with 3/4″ barb connections.

Q: Does this replace the SM-909 series? A: Yes — the 73979 replaces all discontinued 230V SM-909-NHW, SM-959-NHW, and SM-1212-NHW models with 3/4″ barb connections. The E10 delivers higher flow rates (15 GPM vs 6–12 GPM) with 40% lower energy consumption.

Q: Does this pump have a shaft seal? A: No — the Laing E10 uses a patented sealless, shaftless design with a magnetically driven impeller. There is no mechanical seal to leak or replace.

Q: Is a cord included? A: Yes — a 4-foot (48″) bare cord is included along with a mounting bracket. A Sundance/Jacuzzi mounting frame is NOT included — order the 6000-125 if you need the frame.

Q: What is the maximum flow rate? A: Up to 15 GPM depending on system conditions. Maximum head pressure is 20 feet. Maximum working pressure is 50 PSI.

Q: Can I mount this pump vertically? A: Yes — horizontal or vertical with motor end down only. The bracket rotates to 4 different discharge angles for flexible plumbing alignment.

Q: How quiet is this pump? A: Very quiet — rated at less than 40 dB. Some customers note it may be slightly louder than the original SM-909 it replaces, but it is still virtually silent during 24/7 operation.

Q: What is the maximum water temperature? A: 140°F (60°C). Do not exceed.

Q: Can I use this for a Dimension One spa with a flow switch? A: The 73979 does NOT include a built-in flow switch. For D1 spas that require an integrated pressure/flow switch, see the 01512-320E-KIT or contact Parts4Tubs for guidance.

Q: Is there a lower-cost alternative? A: Yes — the LX WE10-240 is a lower-cost 230V alternative. The Grundfos 10-0138-KIT is a 230V universal alternative with adapters. Contact Parts4Tubs for availability and compatibility.

Q: Do I need a GFCI breaker? A: Yes — GFCI protection is required by the NEC for all hot tub and spa installations.

Q: What warranty is included? A: 1-year manufacturer’s warranty. Contact Parts4Tubs for full terms.

🏆 Why Choose the Laing E10 73979

✅ Most Common 230V E10 Variant — 3/4″ barb fits the majority of spa circulation systems

✅ OEM for Major Brands — Sundance, Jacuzzi, Dimension One, Dynasty, Gatsby, Saratoga, Santa Barbara, Vita Spa

✅ Same Pump as LHB07100138 — Sundance OEM at a universal price point

✅ ECM Permanent Magnet Motor — 71 watts at 3,200 RPM — 40% less energy than predecessors

✅ Patented Sealless Design — No mechanical seal — no leak path — nothing to replace

✅ 15 GPM / 20 ft Head / 50 PSI — Significant upgrade over SM-909 (6–12 GPM)

✅ Built-In Protections — Dry run (microprocessor), overload, and soft start

✅ 90% Heat Transfer — Motor heat warms spa water instead of wasting to air

✅ Whisper-Quiet — Less than 40 dB — virtually silent 24/7 operation

✅ Rotatable 4-Position Bracket — Adapts to any plumbing layout

✅ Compact & Lightweight — Less than 5 lbs — fits in tight equipment bays

✅ 4′ Cord & Bracket Included — Ready to install

✅ Proven Reliability — Laing (Xylem/Goulds) — world-renowned circulation pump manufacturer

✅ 1-Year Manufacturer’s Warranty — Full warranty coverage

🤝 Why Buy From Parts4Tubs

✅ Fast shipping across the United States

✅ Expert advice from spa and hot tub specialists

✅ Competitive pricing

✅ Full warranty support

✅ Hassle-free returns

✅ Related plumbing parts, 3/4″ vinyl tubing, barb fittings, and hose clamps available

✅ Dedicated customer service team

💧 Summary

The Laing E10 (73979) is the most widely used 230V E10 circulation pump — a 1/40 HP, 230V pump with 3/4″ barb connections that fits the standard plumbing in the majority of full-size hot tubs. Same pump as the Sundance OEM LHB07100138 and the pump inside the 6000-125 assembly (sold here without the frame). Features a high-efficiency ECM permanent magnet spherical motor drawing 71 watts at 3,200 RPM (40% less energy than SM-909/SM-1212 predecessors), delivering 15 GPM with 20 ft maximum head and 50 PSI maximum working pressure. Patented sealless, shaftless, leak-proof design with magnetically driven PPO open impeller, ceramic ball bearing, and graphite bearing cap. Built-in dry run protection, overload protection, and soft start. Less than 40 dB, less than 5 lbs, center suction / side discharge, counter-clockwise rotation, 140°F maximum temperature. Rotatable 4-position bracket and 4′ bare cord included. Compatible with Sundance, Jacuzzi, D1, Dynasty, Gatsby, Saratoga, Santa Barbara, Vita Spa, Watkins, Cal Spa, and any 230V spa with 3/4″ barb circulation connections. 1-year manufacturer’s warranty. Available now at Parts4Tubs.

Find the right pump or motor

Enter what is printed on the label of the one you are replacing. Anything that differs is shown with the difference spelled out, so you can judge it for yourself.

EitherComplete pumpMotor only

Make or modelHorsepowerVoltageAny115V230VSpeedAny1-speed2-speedVariable speedAmpsPort size (pumps)Any3/4 in1 in1-1/2 in2 in2-1/2 inFrame (motors)Any48Y48 frame56Y56J56C56 frame

Clear

Port size is the plumbing thread, not the pipe — a 2 inch union measures about 3 inches across the male thread. Amps are compared to within half an amp, since published figures round differently between motor brands. Voltage is never treated as a near miss: a 115V motor is not one step from a 230V supply. Anything whose page does not publish a figure you entered is left out rather than offered with a caveat — search it by name to see it anyway.

Unions and pump cords: pick the union size that matches your pump's ports (see the size chart below), and a 4-wire cord for a 2-speed pump.

Hot Tub Pump Collar & Union Size Chart

Imperial & Metric Specifications

Union Size	Collar Size	Thread OD	Union OD	O-Ring Size
1.5" Female Buttress Thread (FBT)	2.5" / 64mm (Tip to Tip) Measurement	2-1/2" 64mm	2-13/16" 71mm	2-5/16" OD 59mm
2" Female Buttress Thread (FBT)	3.1" / 78mm (Tip to Tip) Measurement	3-1/16" 78mm	3-3/8" 81mm	2-15/16" OD 75mm
2.5" Female Buttress Thread (FBT)	3.6" / 91mm (Tip to Tip) Measurement	3-5/8" 91mm	4-1/4" 108mm	3-7/16" OD 87mm

Important Notes

The union "size" (1.5", 2", 2.5") is nominal and doesn't correspond to any actual measurement.

Collar size is measured from thread tip to thread tip on the pump outlet.

Most hot tub pumps use Female Buttress Thread (FBT) - 98% of applications.

O-ring gaskets may vary between manufacturers - measure your existing gasket for accuracy.

How do I Replace a Hot Tub Pump?

Here's a general step-by-step guide on how to replace a hot tub pump. Keep in mind that the specific steps may vary depending on your hot tub's make and model, so it's essential to consult your hot tub's manual for model-specific instructions. If you're not comfortable with this procedure, it's a good idea to seek professional assistance.

Materials You'll Need:

• Replacement pump
• Screwdriver
• New union O-rings
• A strap wrench, only if a union nut is stuck
• PVC primer and cement, only if you are gluing in new tailpieces

Procedure:

1. Turn Off the Power: Before you begin, ensure the hot tub's power supply is turned off at the circuit breaker or disconnect switch. Safety should always be a priority when working with electrical components.

2. Drain the Hot Tub: If your hot tub is not already empty, you'll need to drain it. Follow your hot tub's manual or manufacturer's instructions for proper draining. (You might not need to do this if you can lock the pump off with the gate valves)

3. Locate the Pump: Identify the location of the existing pump in your hot tub. It's usually located near the equipment area or in a designated pump compartment.

4. Disconnect the Electrical Wiring: Carefully disconnect the electrical wiring from the old pump. This typically involves removing the electrical conduit cover, unscrewing wire nuts, and disconnecting the wires from the terminals. Be sure to note the wire connections or take a picture for reference when connecting the new pump.

5. Disconnect the Plumbing: Depending on your hot tub's plumbing setup, you'll need to disconnect the plumbing connections to the pump. Unscrew the union nuts by hand. If one is stuck, use a strap wrench rather than a pipe wrench, which can crack the nut. Be prepared for some water spillage when disconnecting the plumbing.

6. Remove the Old Pump: Once the electrical and plumbing connections are detached, carefully remove the old pump from its mounting position. Some pumps may be secured with mounting brackets or bolts.

7. Prepare the New Pump: If the new pump is not pre-assembled, you may need to attach fittings, unions, or adapters to match your hot tub's plumbing. Pump unions use buttress threads that seal on an O-ring, so fit new O-rings and hand-tighten the nuts. Do not use thread tape, pipe dope or sealant on them.

8. Mount the New Pump: Position the new pump in the same location as the old one and secure it in place using the mounting brackets or bolts.

9. Reconnect Plumbing: Reconnect the plumbing to the new pump, hand-tightening the union nuts. If you are gluing in new PVC tailpieces, use PVC primer and cement on those joints.

10. Reconnect Electrical Wiring: Reconnect the electrical wiring to the new pump, following the notes or pictures you took earlier. Make sure all wires are properly connected and secure.

11. Turn On the Power: Restore power to the hot tub by switching on the circuit breaker or reconnecting the disconnect switch.

12. Test the Pump: Turn on the hot tub's pump to ensure that it's working correctly. Check for any signs of leaks or irregularities in the plumbing connections.

13. Refill the Hot Tub: Once you've confirmed that the new pump is functioning properly, refill the hot tub with water.

14. Check for Leaks: Inspect the plumbing connections for any leaks. If you find any, turn off the pump, drain the tub again, and reseal the connections as needed.

15. Monitor: Keep an eye on the pump and plumbing for the next few days to ensure everything is functioning correctly and that there are no further issues.

Remember that this is a general guideline, and the specific steps may vary based on your hot tub's design. If you're unsure or uncomfortable with any aspect of this process, please do get in touch, happy to help.

How do I know what size hot tub pump I have?

Determining the size of your hot tub pump is an important step when it comes to maintenance or replacement. To find out the size of your hot tub pump, follow these steps:

1. Check the Manual: The easiest way to determine the size of your hot tub pump is to consult the owner's manual or user documentation that came with your hot tub. The manual typically contains detailed information about the specifications and components of your hot tub, including the pump.

2. Look at the Pump Housing: If you don't have access to the manual or it doesn't provide the information you need, inspect the pump itself. Most hot tub pumps have a label or plate on the pump housing that displays essential details, including the pump's model number, manufacturer, and specifications. You can then send that to me or Google it.

3. Measure the Pump: If the label is missing or damaged, you can measure the pump's dimensions. Measure the diameter of the pump's wet end (the part where the water flows) and the length of the wet end. These measurements can help identify the size and capacity of the pump.

4. Consult the Manufacturer: If you can't find the information on the pump or in the manual, contact the hot tub manufacturer or a reputable dealer. Provide them with your hot tub's model and serial number, and they should be able to identify the correct pump size for your specific hot tub.

5. Online Research: You can also search online using the pump's model number or hot tub's make and model. Many manufacturers provide detailed information about their products on their websites, and you may find specifications for your pump model.

Once you have determined the size and specifications of your hot tub pump, you can proceed with maintenance, repairs, or replacement if necessary. Keep in mind that replacing a hot tub pump with the same size and capacity as the original is crucial to ensure proper water circulation and filtration in your hot tub. If you're unsure about any aspect of this process, get in touch, always happy to help.