no water coming out of the hot water faucet in my tub
Start under the house with the space heater. The house temp inside is fine. Turn on all the cold water sources all the way. The more water you can get flowing the better. The cold water feeds the hot water heater. Go to the street and place some insulation inside the meter box (towels, rags,etc.) If you have any exposed piping outside... wrap it. If it's a townhome you may be sharing water with a neighbor and its on their side. If your water is off and the meter is spinning it may not be on your side.