What size swimming pool boiler is required?
One thing to remember is that bigger is usually better. The big cost is the initial purchase and installation. The cost to upgrade to a bigger heat source is minor in most cases. The formula for calculating a swimming pool boiler size is surface area x temperature rise x 15. Assuming the lowest outside temperature we will swim at is 60 degrees F and the swimming pool will be heated to 80 degrees, this leads to a 195,000 BTU boiler. On top of that we have to take into consideration shading, wind and elevation factors. If space allowed, even better capacity was wanted, swimming at Christmas was considered or for any reason actually, we would have no problem using a larger boiler.
