Compared to the early models of Rapid Boilers, which featured a flow switch and thus required a certain water flow rate to produce domestic hot water, manufacturers have equipped modern boilers with a new, more precise mechanism for detecting DHW demand.
The cast iron radiator, or cast iron heater, has excellent thermal inertia properties and is well-suited for use with condensing boilers. It requires low operating temperatures, allowing the condensing boiler to modulate significantly, entering the condensation range.
In Storage Boilers of any type, there is a reserve of sanitary water already at temperature and ready for use. The boiler keeps it hot, thus reducing ignition times and increasing the responsiveness of the domestic hot water system.
Underfloor heating is a type of distribution that spreads heat evenly throughout the rooms where it is installed. It requires different operating temperatures compared to cast iron or aluminum radiator systems.