Abstract: A circulating hot water system has a hot water flow circuit defined by pipework leading out from and back to an in-line heater, and including a pump to drive circulation of the hot water. Each of multiple user points has an outflow branch conduit and a return flow branch conduit with a common wall for heat exchange, as does the main flow circuit: the outflow conduit surrounds the return conduit. Water is fed into the system from a pressurized cold water supply main through a check valve. Sensors are used to monitor water temperatures and flow conditions around the system. A programmed control processor can control heating and pumping rates in various regimes, e.g. to maintain system temperature above a predetermined threshold. An isolation valve adapted for concentric double pipes is also described.

Abstract: The fitted activity pad is a covering that is fitted onto a tabletop in order to protect the table top from damage and shield children from potential injury from bumping against the edges of the tabletop. The fitted activity pad has a top portion decorated with indicia and at least one sidewall extending around the top portion of the pad. The sidewall is stuff with a cushioning material. An elastic gather extends around the periphery of the sidewall, which provides the necessary elasticity to maintain the fitted pad onto the tabletop. The fitted activity pad is reversible and may be designed with additional indicia on the bottom surface of the pad.