Hello from Madrid.
I have just had a RTB 16kW + Silo 350kg installed. It is connected to a 500L thermal store (buffer tank) that also has a spiral to heat from solar panels. The solar panels will have to wait until I have more money and a new roof. The hot water for the taps comes from anther spiral inside the buffer tank, and there is a circulator on the hot water circuit because there are more than 20m from the boiler house to the house. There is a second pump on the heating circuit and 3-way mixing valve controlled by the weather compensation of the boiler.
I hope to post some more pictures later, and a diagram of how everything is connected.
http://stokercloud.dk/dev/amrtb.html