“Can this unit be used without a hot water heater to heat the incoming water?”
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Yes, the Combo can be used with only the cold water hose connected. The Combo does not have a heater for wash, so no energy will be used to adjust the temperature of the water so they will get cold only. Only a small amount of cold water is used to “prime” the heat pump system for the drying portion of the cycle. Otherwise, no water is used for drying. -- Some things to consider: 1. You should select “tap cold” for the temperature setting for the cycle. It will use only tap cold water for all temperatures selected other than “Extra Hot”. 2. When “Extra Hot” is selected, which is the only temperature option for Sanitize with Oxi, the Combo will display an error message and not allow this cycle to run. You will be choosing to not have Extra Hot available with your actions. Similar issue with Extra Hot selection which is an option on Normal, Whites, and Power Clean. 3. You should cap the hot water port on the Combo with either a valve cap or by hooking a hose to the other faucet but not turning that faucet on to prevent any minor dripping of water out of the back of the unit. We also recommend using the Eco Cool cycle with this type of installation to slightly extend the wash time to deliver great wash performance. Lauren@GEAppliances
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