A change in any one of the three types of motion affects the other two. Imagine three lines running through an airplane and intersecting at right angles at the airplaneâs center of gravity. 1  Rotation around the front-to-back axis is called roll.  Rotation around the side-to-side axis is called pitch.
A system boiler heats your central heating system directly and produces hot water for your cylinder. A system boiler, just like a regular (conventional) boiler works on the principle of stored hot water.However, a system boiler differs from a regular boiler in some important respects.n example of a central heating and hot water system layout using a system boiler with an open-vented hot water cylinder. View our system boilers. An example of a central heating and hot water system layout using a system boiler with a pressurised unvented hot water cylinder. View our system boilers.
A gas boiler is similar to a gas furnace in that it is a system that uses natural gas -- like propane -- to heat your home. However, a furnace provides heat by using air, while a boiler uses water. This water can be sent through pipes to provide heat to fan coil units to provide warm air, but it can also be used for heating swimming pools, baseboard heaters, radiant floor heaters, snowmelt systems, or even as steam to radiators.