The electric valves are a must. They will start the heating when the pool water is cooler than the desired temperature and turn off when the pool reaches that temperature. My system will turn the valve if the sun is obscured by a large cloud.
You can set the system up to cool the pool at night if desired. With my system the collectors often have no water running through them during the summer and have suffered no damage.
When you plan a system decide when you want to swim. If you want to swim in the colder months you may need to add additional heat.
The only problem we have with our system is that I like a warm pool and my wife likes a cooler pool.
I have no idea of the system cost since it came with the house.
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