Dishwasher Home › Forums › Public Forums › General Plumbing › Dishwasher This topic has 3 replies, 3 voices, and was last updated 23 years, 6 months ago by SylvanLMP. Viewing 3 reply threads Author Posts 5 Mar 2001 at 2:28 am #274719 MasterPlumbersKeymaster What does the dishwasher hook to, hot or cold water valve? 5 Mar 2001 at 2:38 am #290275 racefanoneParticipant The hot side 5 Mar 2001 at 3:30 am #290276 racefanoneParticipant The hot side 5 Mar 2001 at 3:44 am #290277 SylvanLMPParticipant Hot water and hopefully at least 140-160 degrees for proper cleaning and Germ killing. Some Dish washers do have a preheater BUT that is normally used for disenfection as a temperature booster.to be safe read the manufacturers instructions Author Posts Viewing 3 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In