Ok, I am sooo sorry to hear about your tank! I just recently went through the same thing, and I lost EVERYTHING! Not even the live rock survived>|< R.I.P., but you are possibly in luck! I reported my situation to marineland and this is what they told me to do:
1) Give a detailed letter about your tank and heater (when you set it up, size of your set-up, animals, frequency of wc's, LR, lighting, position of heater, additives added, etc.), and THE MORE DETAILED THE BETTER!
2) Pics of your tank if you have them
3) Get a receipt/estimate of the livestock you had in your tank with letterhead (I got that from my lfs)
4) Send the heater
5) Your return name and address
Then I Mailed it all to:
United Pets Group
Attn. CLAIM
3001 Commerce Street
Blacksburg, VA 24060
I would call them @ (800)322-1266 too just so they have a record of your situation. They fully reimbursed me within a month of filing the claim for all the livestock lost in my tank. I know it's not the same as what you had, because I had to start over from scratch, but it's good to know Marineland is such a good company...GOOD LUCK!!