Pumps' Perplexities

The way society is going these days, it will be difficult
to keep warm during the winter......

The latest news is that San Francisco wants to ban
indoor fireplace of wood, due to pollution.......

There are people who do not want you to burn coal......
There are people who do not want you to use oil or
propane, a oil by-product.......

SO THE ONLY THING THAT IS LEFT TO HEAT YOU
IS THE SUN......

A question for the "great minds", how do you keep
warm on a cloudy day or during the night?.......

(Remember a solar panel requires an electric pump
to run it.)