🔧 Waterway Tiny Might Spa Circulation Pump — 1/16 HP 115V 1″ Union Side Discharge | 3312610-14

Ultra-compact, energy-efficient circulation — uses less power than a 100-watt light bulb

♨️ Product Overview

The Waterway Tiny Might is the smallest and most energy-efficient pump in the Waterway “Might” circulation pump family — a compact 1/16 HP, 115V circulation pump that draws just 0.8A while delivering 14–18 GPM of continuous 24-hour water circulation. This pump uses less power than a 100-watt light bulb, making it one of the most economical circulation pumps available for spa applications.

Designed with a 1″ MBT (male buttress thread) union connection on both suction and discharge, the Tiny Might features a clever dual-purpose fitting: the 1″ threaded connection accepts standard 1″ FBT pump unions, while the inside of the fitting doubles as a 1/2″ slip connection — allowing you to glue 1/2″ I.D. PVC plumbing directly into the pump without unions. The side discharge design delivers up to 60% greater efficiency than center discharge configurations, and the large 6-1/2″ diameter wet end provides higher head pressure than you’d expect from such a compact pump.

The wet end can be rotated 90 degrees right or left to align with existing plumbing by loosening just a couple of screws. Built with a 303 stainless steel 3/8″ motor shaft, larger motor bearings for longer life, and improved ventilation for cooler operation, this American-made pump is the OEM circulation pump in Master Spas (Legend Series) and Vita Spas (H.E.E.T. system) among others. Backed by a 1-year Waterway manufacturer warranty.

⭐ Key Features

• ✅ Ultra-Low Power Draw — Just 0.8A at 115V — uses less electricity than a 100-watt light bulb
• ✅ 1/16 HP / 14–18 GPM — Compact power with reliable flow for 24-hour continuous circulation
• ✅ 1″ MBT Union / 1/2″ Slip Dual Connection — Threaded for 1″ unions OR glue 1/2″ PVC directly
• ✅ Side Discharge Design — Up to 60% more efficient than center discharge pumps
• ✅ Large 6-1/2″ Diameter Wet End — Higher head pressure from a compact package
• ✅ 303 Stainless Steel Motor Shaft — 3/8″ diameter for improved impeller alignment and durability
• ✅ Rotatable Wet End — 90 degrees right or left for easy plumbing alignment
• ✅ Larger Motor Bearings — Extended motor life compared to earlier designs
• ✅ Improved Motor Ventilation — Larger housing keeps motor running cooler
• ✅ Higher Capacitor Rating — Easy starting even when low voltage is encountered
• ✅ Made in the U.S.A. — American-manufactured by Waterway Plastics
• ✅ 1-Year Manufacturer Warranty — Full Waterway warranty coverage

🔩 Technical specifications

⚡ Electrical Requirements

💡 CORD OPTIONS: If no cord is included, the pump comes with pigtail connectors with tabs. Purchase a compatible cord separately — common options include AMP cord, J&J cord, or NEMA cord (813-0032). You can also reuse the cord from your existing pump.

🔄 Compatibility Guide

Waterway “Might” Circulation Pump Family — Complete Comparison

⚠️ CHOOSING THE RIGHT PUMP: The Tiny Might uses 1″ connections and delivers 14–18 GPM. The Iron Might and Uni-Might use 1-1/2″ connections and deliver 40 GPM. These are NOT interchangeable without replumbing. Match your existing connection size first, then verify voltage.

1″ Union Connection Options (Sold Separately)

💡 DUAL-PURPOSE FITTINGS: The Tiny Might’s connections accept 1″ FBT pump unions OR you can glue 1/2″ I.D. PVC pipe directly into the pump fittings — no unions needed for 1/2″ plumbing installations.

Compatible Spa Brands (Verified)

• ♨️ Master Spas — Legend Series (OEM part X321800)
• ♨️ Vita Spas — H.E.E.T. (High Efficiency Energy Transfer) system

What This Pump Replaces

The Tiny Might 3312610-14 replaces earlier versions and discontinued models of the same pump, as well as various OEM and distributor part numbers used across spa brands.

🔗 Alternate Part Numbers & Cross-References

🔧 Parts and fittings for this

	Part	Our part number	Availability	Price
	Waterway Union 400-1940	400-1940	45 in stock	$5.82	Add to cart
	Waterway Union 400-1990	400-1990	97 in stock	$5.97	Add to cart

Primary Part Numbers

Cross-Reference Numbers

Related But NOT Interchangeable

Replacement Parts

🛠️ Installation Requirements

What’s in the Box

• ✅ Waterway Tiny Might Circulation Pump
• ✅ Pigtail connectors with tabs (for wiring)
• ⚠️ Cord — may or may not be included depending on production run
• ❌ Unions NOT included — purchase 400-1940 or 400-1990 separately (if needed)

Mounting

Plumbing

Connection Options

You have two plumbing options with the Tiny Might:

Option 1 — 1″ Unions (Most Common): Purchase 1″ FBT unions (400-1940 for 3/4″ barb or 400-1990 for 1″ slip) and thread them onto the pump’s 1″ MBT connections.

Option 2 — Direct 1/2″ Slip: Glue 1/2″ I.D. PVC pipe directly into the pump fittings without unions. This is a permanent connection.

Wet End Rotation

The wet end can be rotated 90 degrees right or left to align with your plumbing:

1. Loosen the wet end screws
2. Rotate the wet end to the desired position
3. Retighten all screws evenly

Installation Notes

⚠️ GFCI protection is required by the National Electrical Code (NEC) for all hot tub and spa installations.

⚠️ If no cord is included, use the pigtail connectors to wire a compatible AMP, J&J, or NEMA cord, or reuse your existing pump cord.

⚠️ Never run the pump dry — ensure the spa is filled and plumbing is primed before first startup.

⚠️ This is a 115V pump — verify your spa’s circ pump circuit is 115V before ordering. For 230V applications, use the Tiny Might 230V (3312620-14) instead.

⚙️ Maintenance Guide

Routine Maintenance

Warning Signs — Replace Pump If:

• Water leaking from shaft seal area
• Unusual noise (grinding, squealing, rattling)
• Reduced or no water flow
• Motor overheating or tripping breaker
• Motor fails to start
• Visible damage to wet end or motor housing

Seal Replacement

The Tiny Might uses a 2-part mechanical seal:

• 📍 811-4000A — Metal seal back (shaft size 3/8″, seal width 1-1/8″ OD, height 7/16″)
• 📍 811-4000B — Ceramic seal insert (mating ring 7/8″ diameter, thickness 5/32″)

⚠️ IMPORTANT: Both parts (A and B) are required to complete a seal replacement — they work as a matched pair.

💡 NOTE: Some Tiny Might pump designs have the metal spring on the impeller and the ceramic ring static on the volute. In these cases, the wet end may need to be replaced as a complete unit rather than individual seal components. Inspect your pump before ordering seal parts.

🎯 Ideal Applications

❓ Frequently Asked Questions

Q: What is the flow rate? A: 14–18 GPM. This is a low-flow circulation pump designed for 24-hour continuous duty, filtration, and low-flow heating systems — not for powering jets.

Q: How much electricity does this pump use? A: The Tiny Might draws just 0.8A at 115V — less power than a 100-watt light bulb. This makes it extremely economical for 24/7 operation.

Q: What size are the connections? A: 1″ MBT (male buttress thread) on both suction and discharge. The fittings also accept 1/2″ I.D. PVC pipe glued directly inside (slip connection), allowing installation without unions on 1/2″ plumbing.

Q: Do unions come with the pump? A: No. Unions are sold separately. Use 400-1940 (1″ FBT × 3/4″ barb) or 400-1990 (1″ FBT × 1″ slip) depending on your plumbing. Alternatively, glue 1/2″ PVC directly into the fittings.

Q: Does a power cord come with the pump? A: The pump may or may not include a cord depending on the production run. It comes with pigtail connectors with tabs. If no cord is included, reuse your existing cord or purchase a compatible AMP, J&J, or NEMA cord (813-0032) separately.

Q: Can the wet end be rotated? A: Yes. The wet end rotates 90 degrees right or left by loosening the wet end screws. This allows you to align the discharge with your existing plumbing.

Q: Is this the same pump as the 300-9000? A: Yes. The 3312610-14 is the current version that replaces the earlier 300-9000 and other previous Tiny Might models. It features an improved motor with larger 303 stainless steel shaft, larger bearings, better ventilation, and higher capacitor rating.

Q: What’s the difference between this and the Iron Might? A: Size and flow. The Tiny Might has 1″ connections and delivers 14–18 GPM. The Iron Might has 1-1/2″ connections and delivers 40 GPM at higher amperage (1.3A at 115V). Choose based on your spa’s connection size and flow requirements.

Q: Will this fit my Master Spa? A: The Tiny Might is the OEM circ pump in Master Spas Legend Series (part X321800). Verify your specific model uses a Tiny Might before ordering.

Q: What voltage does this require? A: 115V / 60Hz. For 230V spas, use the Tiny Might 230V (3312620-14, 0.4A) instead.

Q: How do I replace the seal? A: The Tiny Might uses a 2-part seal — 811-4000A (metal back) and 811-4000B (ceramic insert). Both parts are required. Some pump designs may require replacing the complete wet end rather than individual seal components — inspect before ordering.

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

Q: What warranty is included? A: 1-year manufacturer warranty from Waterway Plastics. Contact Parts4Tubs for full terms.

🏆 Why Choose the Waterway Tiny Might

• ✅ Ultra-Low Energy — Just 0.8A at 115V — less than a 100W light bulb for 24/7 operation
• ✅ Compact Design — 10.1″ × 5.9″ × 3.4″ fits the tightest equipment bays
• ✅ Flexible Connections — 1″ MBT unions OR 1/2″ slip — adapts to your plumbing
• ✅ Side Discharge — Up to 60% more efficient than center discharge designs
• ✅ Large 6-1/2″ Wet End — Higher head pressure from a compact pump
• ✅ 303 Stainless Steel Shaft — 3/8″ diameter for improved impeller alignment
• ✅ Larger Motor Bearings — Extended motor life vs earlier designs
• ✅ Improved Ventilation — Cooler operation for longer service life
• ✅ Higher Capacitor Rating — Reliable starting in low-voltage conditions
• ✅ Rotatable Wet End — 90° adjustment for easy plumbing alignment
• ✅ Made in the U.S.A. — American-manufactured quality
• ✅ Serviceable Seal — 2-part replacement seal available (811-4000A/B)
• ✅ 1-Year Warranty — Full Waterway manufacturer 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
• ✅ Complete Waterway circulation pump range in stock (Tiny Might, Iron Might, Uni-Might)
• ✅ Compatible unions (400-1940, 400-1990), seals, and accessories available
• ✅ Dedicated customer service team

✨ Summary

The Waterway Tiny Might 3312610-14 is a compact 1/16 HP, 115V circulation pump that delivers 14–18 GPM while drawing just 0.8A — less power than a 100-watt light bulb. Featuring 1″ MBT / 1/2″ slip dual-purpose connections, side discharge for optimum flow, a large 6-1/2″ wet end for higher head pressure, 303 stainless steel motor shaft, rotatable wet end, and improved motor ventilation and bearings, this American-made pump is OEM in Master Spas and Vita Spas. Unions and cord sold separately. Extensive cross-reference library covering 20+ alternate part numbers. Order from Parts4Tubs today with 1-year Waterway manufacturer warranty.