| Corriehac, Did you notice that he had a GAS HEATER?? That being said, I would check the thermostat. It doesn't want to maintain temperature when not making a draw. When you make a draw it pulls cold water into the heater forcing the burner to kick on and bring the water up to temperature.
Also if you don't flush your heater on a regular basis it will build up minerals on the floor that will act as insulation and not will only cut down on the heat from the burner but will increase your energy bill. For long life and fewer troubles you should keep your heater clear of mineral build-up by flushing on a regular schedule. let me show you how. Attach a hose to the boiler drain at the bottom of the tank. With the pressure on, open the boiler drain and let it run untill the water runs clear. You will see a spurt of red,(rust) followed by white grains,(lime or calcium carbonate). This shouldn't take more then a few minutes. Do this monthly to keep it clear. Don't forget to flush it out every month. Your heater will thank you for it. Hope this helps, Tom | 
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