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Water only runs through a pool heater when not in use if the heater doesn’t have a bypass system. A bypass system stops the flow of water through the heater when not in use. If you don’t have one, then yes, water will still run through the pool heater even when not in use. Not having a bypass system may increase the effects of wear and tear on your pool heater or disrupt the water’s chemical balance.

It’s a good idea to wait at least 24 hours after opening your pool before you swim in it. Pool opening often involves shocking the water, and the chemical levels need to come down a bit before it’s safe to swim. You can continue testing your water pH and chlorine levels if you’re in a rush. It’s wise to wait until your chlorine levels drop to under four parts per million (ppm) and you have a water pH of between 7.2 and 7.8. You can artificially lower your water pH to speed up the process.

Gunite pools are not exactly easy to maintain—but we wouldn't call them "high maintenance." It's one of the longest-lasting pool options, but its porous surface does require a lot of care. You’ll need to thoroughly clean the pool often to prevent stubborn algae growth, and the pool will require higher chemical levels to keep it clean. 

The time it takes for a pool heater to heat a pool can range from eight to 48 hours, with an average of about 12 hours for the initial heating. For a more specific example, an average-sized 15,000-gallon pool may take six to 10 hours to heat up by 10 degrees. The exact duration depends on several factors, including the pool's size, the type and size of the heater, the starting water temperature, and the outside air temperature. It may take some trial and error to determine the precise time your specific pool takes to reach a desired temperature.