heater install

Help. We replaced our previously blow Pentair MasterTemp 250 with the exact same model, thought 5 years newer, same plumbing same position everything and when we set it up exactly as is out of the box, it wont kick on. We have put a manometer to the test port on the outsdie the heater and...

Does anyone have a recommendation for an online pool supply store? I need to buy a new heater (was looking for Pentair Mastertemp 250k). I wanted to install it myself as the quotes to have it installed are nearly double the cost of the heater. I originally tried to buy from pool supply stores in...