Nearly 2,000 years after it was first built, we're discovering just how ingenious Roman central heating really was. For eight days, a team of volunteers heated our reconstructed Roman hypocaust continuously. This was an experiment to find out what temperatures can be achieved, how long does the system take to get up to temperature and how long does the system retain the temperature once the fire has been extinguished. Our hypocaust is based on archaeological evidence from the remarkable Sparsholt Roman Villa, located around 6 km NW of Winchester, England. The excavation was one of the earliest Roman villas in...