A room perimeter heating/cooling radiator with a non symmetrical elliptical transverse cross section, that utilizes low to medium temperature heat transfer fluid (generally water or water/glycol) in a new design with an enhanced primary only heat transfer surface having an internal spiral or helix to circulate the water around the inside of the primary surface to enhance the heat transfer, and an internal conduit that provides both freeze damage protection and the ability to cross connect multiple identical radiators for increased efficiency. The primary intended location is within inches of the building windows.

A retrofittable towel warmer for use with a hot tub preferably comprises a flexible conduit portion which is attachable to one of the jets of the hot tub together with a rigid thermally conductive portion which is detachably mountable on an exterior mast support. There is also preferably provided an exterior housing surrounding the thermally conductive portion designed to provide maximum thermal contact with the cloth material to be heated. The entire unit may be immersed in the hot tub or pool water when not in use. In an alternate embodiment a container having a thermally absorptive medium is provided in a structure which is easily mounted on the mast. In an alternate embodiment a container having a thermally absorptive medium is provided in a structure which is easily mounted on a supporting mast.

The present invention relates to a single pipe collector for a heat pump installation. The collector comprises a pipe (12) intended for installation in a heat pump plant, in which pipe a heat transfer liquid circulates in a closed cycle for conveyance of heat that is absorbed from a heat source to a heat pump and return of the heat transfer liquid back to the heat source. The inward surface (14) of the pipe has an uneven surface structure that comprises indentations and/or elevations (16). The present invention also relates to heat pump plant comprising the collector.

The invention relates to a tube register (RR) for a heat exchanger (WT), in particular a heating element or cooling element, through which a heat transfer fluid may flow, and which has two distributor lines (1, 2), between which a plurality of connecting tubes (3) extend which fluidically connect the first distributor line, also referred to as the supply distributor (1), to the second distributor line, also referred to as the return distributor (2), the tube register having a linear supply distributor (1) and a linear return distributor (2) running in parallel thereto, between which a plurality of connecting tubes (3), situated in a plane, extend, the first ends (3a) of the connecting tubes (3) in each case being fluidically connected to the supply distributor (1), and the second ends (3b) of the connecting tubes (3) in each case being fluidically connected to the return distributor (2), characterized in that the connecting sites (P1) between the supply distributor (1) and the connecting tubes (3) are situated eccentrically, relative to the center axis (M1) of the supply distributor (1), on the supply distributor (1), and the connecting sites (P2) between the return distributor (2) and the connecting tubes (3) are situated eccentrically, relative to the center axis (M2) of the return distributor (2), on the return distributor (2).

A collector for a heat pump installation includes a pipe to circulate a heat transfer liquid between a heat source and a heat pump. An inner surface of the pipe has an uneven surface structure that includes at least one of indentations or elevations extending helically in a longitudinal direction. The indentations or elevations are arranged to create a turbulent flow of the heat transfer liquid in the pipe.