We have owned a portable heater from hydrosil for years and had issues twice with before. We were sent replacement parts which worked fine until the unit malfunctioned again. This time they told us to send it back which we did on 11/20/12. We have been waiting ever since for our replacement heater. Tried calling and leaving messages but as further research found the company has been closed we realize we are out of luck. We are out the cost of the heater as well as shipping it back! Very disappointed and plan to file complaints with the states they had offices in.