More and more people on the subway are finding that their pipes are frozen.
Suntech Heat, Air and Plumbing said you should run taps on outside walls with a pencil-wide flow of hot and cold.
If you have access to the manifold where the water enters your house, you may be able to use space heating there safely and the plumbing should eventually open.
Suntech said even using a space heater on the manifold or under the sink will take hours to clear the plumbing.
Make sure your faucet is on so the water will start after thawing.