We have a 1700 square ft. home heated by gas hot water baseboard heat , well my gas bill , during winter is about $500.00/month , trying to save $ we installed a pellet stove , Englander EV25 which claims 2000 SqFt heating capabilites , after turning thermostats , upstairs and down to 50* , the EV25 keeps the place 55* up and about 70* down not bad i thought. So the question is , since the heating pipes are on the outside walls how do i keep these from freezing up any advice would be helpful.