 When you need a new water heater, you need it now. Call the Constellation Home Hot Water Hotline for same-day installation guaranteed. You won't have to wait for an in-home estimate because you get our best price right on the phone. And now you can save up to 20% for a new water heater installed on the same day. Call the Constellation Home Hot Water Hotline at 888-243-2120. Call before 4 p.m. or Sunday before 1 p.m. for same-day installation guaranteed. 89794.