My wife runs a miniatures museum on site, and one of the buildings featured is a Wizards' Academy. It is guarded by a dragon in the basement. He's there to look after the treasure, and keep the tax inspectors away, of course, but just for fun I tell the younger visitors that he's for the central heating.
The real fire-breathing dragon on site is the wood-burnining boiler manufactured by Heizomat, which really is used for the central heating. It is powered by shredded wood chips which are delivered by a giant lorry into a big (30M cubed) bunker. About 33% of mainland France is given to forest, and wood-fired heating is encouraged by the government here as sustainable and carbon-neutral (over the lifetime of the tree)
It has a maximum power output of 100KW, and can heat the two gîte buildings and also the pool, even in the depths of Winter. I gave it a good clean-out today so that it can perform reliably over the Summer period, heating the pool and the water for washing.
The fire-breathing dragon