I live in a manufactured home(double wide), It sets on a slab and is connected to a garage where I'm hoping to install a wood boiler this summer. Because I have no basement and my garage is to small for a storage tank I'm wondering what you guys think about building a storage tank under the house. The problem I see is that it will have to be really large in the length and width because it can only be abount 2' deep. With this increased surface area will it be to inefficient? My only other option is to bury a tank. Which would be the most efficient ??