Replacing the water heater element in an RV. If your water heater is not making enough water, it is taking too long to heat water, or you might have .Heating elements on electric water heaters sometimes fail long before the water heater, but replacing them in a water heater is an easy DIY repair..Edit Article wiki How to Repair an Electric Water Heater. Three Parts Repairing a Heater Replacing Elements Replacing Controls Community Q A. Ran out of water?.Have you noticed that your water heater isn’t able to produce the volume of water that it once did? One of the commonest causes of this is a broken dip .