Each of the three machines must be from categories B3A, B4, C or D but only one B3A machine can be sited, by agreement, as part of this entitlement.
Rhaid i bob un o'r tri pheiriant berthyn i gategorïau B3A, B4, C neu D, ond dim ond un peiriant B3A y gellir ei leoli, drwy gytundeb, fel rhan o'r hawl hon.