What type of appliance is specifically designed to supply hot water or steam?

The correct answer is a boiler, low pressure, as it is specifically designed to generate hot water or steam for heating purposes. Boilers operate by heating water in a closed system, allowing it to be converted into steam or remain as hot water, depending on the application. This heated water or steam is then distributed throughout a building to provide heating via radiators, underfloor systems, or other means.

Boilers can operate at different pressure levels, but a low-pressure boiler is generally defined as one that operates at a maximum pressure of 15 psi or less. This makes them particularly suitable for residential and small commercial applications, where the demand for steam or hot water is significant but does not require the higher pressures associated with industrial systems.

In contrast, a heat pump transfers heat instead of generating it and is typically used for both heating and cooling purposes, making it unsuitable for being classified straightforwardly as a hot water or steam supplier. Similarly, a radiator is a heat distribution device and does not generate hot water or steam on its own; rather, it receives hot water or steam from the boiler. A "boogie" does not refer to any type of appliance related to heating systems and is not a relevant term in this context.