Buyer's Guide

Pool Heat Pump Sizing Guide: Find the Right Size for Your Pool

Use your pool size and local outdoor temperature to find the recommended Varminpool model. Outdoor temperature here means the coldest average daytime air temperature during your swim season — not your desired water temperature.

  • Step 1. Find your pool size.
  • Step 2. Identify your local outdoor temperature.
  • Step 3. Match the recommended model.
  • Step 4. Size up for faster heating.
Energy-Efficient Heating
Extends Your Swim Season
Pool Cover Recommended

Quick Sizing Rules

This guide is for typical residential pools. Pool volume, local air temperature, wind exposure, desired water temperature, and pool cover usage can all affect heating speed.

1

Start with gallons

Choose the column that matches your pool volume. If between two sizes, use the larger one.

2

Check temperature

Colder climates require more heating capacity to maintain water temperature.

3

Match the model

The listed model is recommended for steady temperature maintenance.

4

Size up if needed

Choose one size up for faster heating, windy areas, or frequent pool use.

Recommended Model by Pool Size

Swipe horizontally on mobile to view all pool sizes.

Pool Size(Gal) ≤5k ≤7k ≤9k ≤12k ≤16k ≤18k ≤21k ≤23k ≤28k ≤33k ≤42k
42-52°F V10 V10 Plus V18 V18 Pro V25 V25 V30 V35 Ultra V25*2 V30*2 V35*2
52-62°F V7 Plus V10 Plus V18 V18 V25 V25 V30 V35 V35 Ultra V35 Ultra V35*2
62-72°F V5 V7 Plus V10 Plus V18 V18 Pro V18 Pro V25 V25 V35 V35 V30*2
≥72°F V5 V7 V10 V18 V18 V18 Pro V18 Pro V25 V30 V35 V35 Ultra

* "V25*2 / V30*2 / V35*2" means two units are recommended.