4.—(1) Subject to paragraph (2), the domestic tariffs set out in the Schedule shall apply to all water supplied to premises which are used exclusively for residential purposes and such tariffs shall not apply —
(a)
where all or part of the premises is used for the purposes of or in connection with any trade, business or profession; or
(b)
where all or part of the premises is used as a hotel, service apartment, boarding house, hostel, school, place of worship or mess.
(2) Notwithstanding paragraph (1)(a), the domestic tariffs set out in the Schedule shall apply to all water supplied to residential premises approved for use as home offices under the Technopreneur Home Office Scheme by the Economic Development Board or under such other home office scheme as the Board may allow.