Some plumbers don't have the necessary skills or do not have the experience to take on certain jobs, and that could make your situation much worse. Search for reviews of plumbers, or ask friends or family members to recommend a competent plumber. Rarely used valves can fuse together. Periodically turn these valves off and one. Use specially designed oils that can work their way through the buildup to keep them loosened up and operable. Don't just use any drain cleaner. There are some drain cleaners on the market that may damage your pipes. Make certain the one you buy is a brand known for pipe safety. Some of these chemicals kill beneficial bacteria in your plumbing that is needed for the system to function correctly, and they may also be quite harmful to humans. If you see a pipe coming out of the drainage pipe when putting in your new water heater, reconnect it before you finish the job. This pipe is probably for recirculation of the water and it works to keep energy usage to a minimum by making water heating more efficient. More information about Recommended Plumber Cinnaminson.
The first step is to check your outside pipes and ensure they are well insulated. When it is cold outside make sure you bring in your hoses or at least drain them. Be proactive about this and save on future repair bills. If you get grout in your pipes, you won't be able to get it out by yourself. Grout can be broken up by yourself, however this generally is only a partial fix. This is much easier if your pipes are plastic, rather than metal.