MOOV

MI900 Variable Speed Inverter Heat

$3,799.00

SKU: MI900

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4 in stock

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MI900 Variable Speed Inverter Heat
MI900 Variable Speed Inverter Heat
$3,799.00
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Pool Heater Size Guide

Choosing the correct pool heater depends on pool size, desired heat-up time, climate, and heater type. Undersized heaters struggle to maintain temperature; oversized heaters heat faster with less runtime.

Heater Types Explained

Gas Pool Heaters (Natural Gas or Propane)

  • Fastest heat-up
  • Works in any climate
  • Higher operating cost

Best for: Quick heating, spas, occasional use


Electric Heat Pumps

  • Most energy-efficient
  • Slower heat-up
  • Performance depends on air temperature

Best for: Warm/moderate climates, consistent heating


Solar Pool Heaters

  • Lowest operating cost
  • Weather dependent
  • Slowest heat-up

Best for: Supplemental heating, sunny regions


BTU Requirements for Natural Gas and Propane
Based on Dimensions and Surface Area (sq. ft.)

Pool Dimensions Surface Area Minimum BTU
14′ x 28′ 392 130,700
15′ x 30′ 450 150,000
16′ x 32′ 512 170,700
18′ x 36′ 648 216,000
20′ x 40′ 800 266,700
24′ x 44′ 1,056 352,000

BTU Requirements for Heat Pumps
Based on Gallons

Pool Size (Gallons) Minimum BTU
Up to 15,000 90,000
15,000 – 25,000 110,000
25,000 – 35,000 130,000
35,000 – 50,000 150,000+

Hourly Temperature Increase
Based on Surface Area (sq. ft.) and BTU

Surface Area 250K BTU 350K BTU 400K BTU
300 2.0º 3.0º 3.5º
400 1.75º 2.5º 2.75º
500 1.5º 2.0º 2.5º
600 1.25º 1.5º 2.0º
700 1.0º 1.25º 1.5º
800 0.75º 1.0º 1.25º
1,000 0.5º 0.75º 1.0º

Gas Supply & Electrical Requirements (Very Important)

Gas Heaters

  • Must verify gas line size and meter capacity
  • Undersized gas supply = poor performance or ignition issues

Heat Pumps

  • Require dedicated breaker
  • Higher amperage draw
  • Longer electrical run considerations

⚠️ Heater sizing is meaningless if utilities are undersized.


Factors That Increase Heater Size Needs

You may need a larger heater if your pool has:

  • Attached spa
  • Waterfalls or spillovers
  • High wind exposure
  • Night swimming
  • Minimal sun exposure
  • Short heating windows (weekends only)

Common Heater Sizing Mistakes

❌ Choosing smallest BTU to save money
❌ Ignoring climate and wind
❌ Forgetting spa heating needs
❌ Not checking gas or electrical supply

✅ Size for how fast you want heat, not just pool volume


Replacing an Existing Heater?

Check the heater data plate for:

  • BTU input
  • Gas type (NG / LP)
  • Voltage & phase
  • Min/max flow rate

If upgrading, going one size larger almost always improves satisfaction.

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

The Full-Inverter Heat Pump with Variable Speed

Thanks to our full-inverter technology, the product adapts the speed of its compressor from 20% to 100% unlike traditionnal heat pumps which only operate at a single speed until they reach the desired temperature. The result? A much lower operation cost and a more accurate and durable technology.

30% to 50%

Seasonal savings on electrical usage.

Reversible Defrost

Just like its little sister the Moov Reversible, the Moov Inverter heat pump works with reversible valve defrosting. Considered to be the best way to defrost the product at low temperature’s, this approach allows the product to operate in the opposite direction to its usual tendency, thus allowing accelerated defrosting to then heat better.

Why chose Full-Inverter technology?

Reduction of Cost

Reduce seasonal electricity costs by 30% to 50%! Calculate your savings with our calculator.

Stronger COP Than Traditional Heat Pumps

The Coefficient of Performance compares the efficiency of a product to other BTU equivalents. The COP of the Moov Inverter is on average 8 instead of 4 or 5.

Deadly Silent

As low as 48dB at 3m. You will not find an equivalence in its category!

Soft Starter

Reduced initial electrical demand which prevents problems with the circuit breaker. Smaller circuit breakers. Extended durability.

Can the Moov Inverter cool my pool?

Some markets require a product that heats pool water and also cools it. Our product allows you to transform your pool into a cold bath experiment as you can see in some Nordic baths!

The Moov Inverter has some models that cool the pool water in addition to heating it. The FIC product line has the same characteristics as the MI models, but has the “cooling” option. Please contact your dealer or Moov Pool Products to receive manuals and documentation for this purpose.

Additional information

Weight 235.90 lbs
Dimensions 44.50 × 17.00 × 39.50 in
Voltage

Port Size

Input Rate

Energy Type

Coefficient of Performance

Max Water Flow

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