Traditional IRA contributions can be tax deductible or partially tax deductible based on MAGI. In 2014, an individual with a MAGI of up to $70,000 is eligible for at least partial deductibility. There are no income limits on who can contribute to a traditional IRA.
When the water heater breaks / leaks whatever the pressure tank is going to loose pressure telling the pump to come on and the pump will run continually as it can not build pressure to shut it off.
If the water heater is located inside of a mobile home without outside access it is most likely a sealed combustion unit. When replacing this type of water heater you will want to replace it with a similar unit or there will be insufficient indoor ventilation and this will cause the water heater to fail.