SPECK

Normblock Multi Series Pool Pump 20 HP, 3-Phase

$8,282.38

SKU: NB715-1020F-016

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Pool Pump Size Guide

Choosing the correct pool pump depends on pool size, plumbing size, and system features (heater, spa, water features, etc.). Bigger is not always better – an oversized pump wastes energy and can damage equipment.

Determine Your Pool Size

Rectangular Pool
Length × Width × Average Depth × 7.5 = Gallons

Round Pool
Diameter × Diameter × Average Depth × 5.9 = Gallons

Recommended Pump Size by Pool Volume

Pool Size (Gallons) Typical Pump Size
Up to 10,000 3/4 HP – 1 HP
10,000 – 20,000 1 HP – 1 1/2 HP
20,000 – 30,000 1 1/2 HP – 2 HP
30,000 – 40,000 2 HP – 2 1/2 HP
40,000+ 2 1/2 HP – 3 HP

⚠️ Note: Modern variable-speed pumps often replace larger single-speed pumps at lower HP ratings due to higher efficiency.

Plumbing Size Matters (Very Important)

Pipe Size Recommended Max
1 1/2″ PVC Up to 1 1/2 HP
2″ PVC Up to 3 HP
2 1/2 – 3″ PVC 3HP +

Oversizing a pump on small plumbing can cause:

  • Excessive noise
  • Poor filtration
  • Heater & filter damage

Pump Type Comparison

Single-Speed Pumps

  • Lower upfront cost
  • Higher electricity usage
  • Becoming obsolete in many states

Best for: Basic systems, budget replacements

Dual-Speed Pumps

  • High & low speed operation
  • Lower energy cost than single-speed

Best for: Simple upgrades where VS is not required

Variable-Speed Pumps (Recommended)

  • Most energy efficient
  • Quiet operation
  • Programmable speeds
  • Often utility rebate eligible

Best for: Nearly all residential pools

???? A 1.65–2.7 THP variable-speed pump can replace most 1 1/2 – 3 HP single-speed pumps.

Systems That Require a Larger Pump

You may need a larger pump if your pool has:

  • Spa spillover
  • Waterfalls or deck jets
  • Solar heating
  • In-floor cleaning system
  • Long plumbing runs

Common Sizing Mistakes

❌ Choosing HP only (ignore flow & plumbing)
❌ Oversizing “just to be safe”
❌ Ignoring filter and heater flow limits

✅ Always size for flow rate (GPM), not just horsepower.

Still Not Sure?

If you’re replacing an existing pump, check the motor label for:

  • HP
  • THP (Total Horsepower)
  • Voltage
  • Plumbing size

If you’re unsure, contact us and we’ll help you choose the correct pump.

The Normblock Multi Series is redefining the limits of plastic pumps. The Normblock Multi takes the non-corrosive and lightweight benefits of plastic higher than any other American manufacturer. This pump is ideally suited for aquatic facilities, fountains, water parks, aquaculture, and pools with elevated salt concentration.

Features:

  • Available in 7.5, 10, 15, 20, 25 & 30 HP Models.
  • The Normblock Multi has a robust horizontal single stage design.
  • Superior slow (1750 rpm) running design reduces vibrations resulting in quiet operation.
  • The housing is made of high performance plastic (THK), corrosion resistant without elaborate internal coating and can be used with higher salt concentrations.
  • Heavy duty energy efficient totally enclosed fan cooled (TEFC) motor, Class F insulation, protection class IP 55. Sealed ball bearings need no lubrication.
  • Shaft coupling allows the motor to be replaced without replacing the mechanical seal.
  • A high wear, rugged Carbon/SIC – EPDM mechanical seal allows for a long life and long maintenance intervals.(Special application seals are available upon request.)
  • Equipped with stainless steel shaft extension.
  • Optional all plastic strainer tank for horizontal flooded suction applications.
  • Every pump is tested to factory & customer’s specifications before leaving the Speck factory.

Please Note: The noise level from both the motor and pump are greatly influenced by how they are installed. Consideration should be given to minimize vibration and noise transmission.

Additional information

Weight 538.00 lbs
Dimensions 55.00 × 32.00 × 32.00 in
Port Size

,

Horsepower

Voltage

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