A breakfast room grate and a kitchen range, if the two fires are back to back, can be utilised to heat a cylinder. There must be a boiler in each fire, the saddle boiler in the range being connected to the cylinder in the usual way, and the boiler put in the grate fire will be connected either to the pipes from the range boiler or independently iuto the cylinder. By this arrangement either boiler will do all that it is capable of doing towards heating the contents of the cylinder, and they will work separately or together without trouble, and without the use of stopcocks or anything of this kind. No alteration is needed to the flues of either stove.