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Why does the water heater need replacing? If this has frozen and split the tank it can be repaired. If the toilet valve has frozen it will need to be replaced. The toilet comes off to access the valve. If you give me a make and model of that I can offer more here and some part numbers. All follow ups are included in our fee. No time limit.
See the attached link to the Atwood Water Heater Service Manual. Print this out so you have it. http://bryantrv.com/docs2/docs/atwoodwaterheater.pdf
In my shop a burst tank costs about $150 to take out and weld up. A new tank is about $195 and takes about an hour to change out. A new water heater is about $450 or more.