Rereading your question, you are asking two different things. You are asking about a solar heater for home with a pool, and you are also asking about installing solar power. I'm not sure that your question is clear. A passive solar heated pool might consist of running black coils of pipes (very inexpensive) on your rooftop to circulate through the pool for "passive heating." This can be very effective if you have enough sunshine. The problem is that it works according to the sun and temperatures. An "active" solar heater might consist of very expensive and inefficient solar cells on the roof, to try and capture the sunlight, and converting to power, to run a traditional pool heater.
"Is it worth installing solar power?"
Are you also trying to power the house from the solar? If so, the passive solar heater won't serve that purpose. Today's solar panels are very inefficient, expensive and not very durable. I'd wait on future technology and cheaper pricing. Typically, you would have to stay in a home more than seven years in order to see any returns on any "active" solar units, and we all know that people don't typically stay in a house more than seven years. Hurricane comes, and you can say goodbye to those solar cells. Wait until we get paint-on solar technology, or at least when it is affordable to use the roll-up solar matts which might be easier to remove when a storm approaches.