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

The plumbing