5 rows Contents. You might want to check it out if you like a high capacity pool. Best Inground Pool Drop In Steps Best Above Ground Pool Swimming Pool Steps Inground Pools Bigger is normally better. Best inground pool heaters . They are however expensive to operate and. The Sta-Rite SR400LP is a decent pool heater for both outdoor or indoor installations on spas and pools. Warm your pool with the powerful and popular Hayward HeatPro Heat Pump. Intex 28685E Solar Mat Above Ground Swimming Pool Water Heater for 8000 GPH Pool Black 2. Ft Solar Heater for Aboveground. They heat up a pool relatively fast regardless of the air temperature. When choosing the best swimming pool heater for your in-ground pool youll want to evaluate factors such as water surface area seasonal temperatures altitude desired BTU output and more. Best Overall Pick. This implies fewer expenses on gas and efficient heat transfer. The Fibropool FH 220 Swimming Pool Heater is considered t...