Highly social, Prairie Dogs live in large colonies called âtownsâ and in collections of families that can span hundreds of acres. A Prairie Dog town may contain 15 to 26 family groups, made up of a series of burrows with mounded entrances. Mother Prairie Dogs provide most of the care for the young.
BTU, or British thermal unit, is the industry-standard used to measure the heating efficiency of furnaces. In addition to BTU ratings, furnace manufacturers might include a Manual J Load rating and a percentage of energy efficiency.
Radiator outputs. The BTU rating for a radiator is normally specified in the catalogue. It basically depends on how big it is, and you can double the value if it is a double radiator. Actually a double is not quite the same as two singles of the same size, but for rough and ready purposes, you can ignore this.adiator outputs. The BTU rating for a radiator is normally specified in the catalogue. It basically depends on how big it is, and you can double the value if it is a double radiator. Actually a double is not quite the same as two singles of the same size, but for rough and ready purposes, you can ignore this.