The hereditament (unit of non-domestic property with a standalone rating assessment) as a whole must meet this definition and heat network relief will not be available for part of a hereditament.
Rhaid i'r hereditament (uned o eiddo annomestig ag asesiad ardrethu ar wahân) yn ei gyfanrwydd ateb y diffiniad hwn ac ni fydd rhyddhad rhwydweithiau gwres ar gael ar gyfer rhan o hereditament.