The water heater problem
Note: I never finished calibrating the heater after converting to propane gas. The water heater, a Rennai gas on-demand type, has had problems for a while. The temperature rises and falls. The water tends to get too hot or too cold. I accidently discovered that the initial on-time delay could be bypassed by turning on the tub spigot for a moment. The 'In Use' light comes on immediately if I do. This implies the pressure sensitivity of the heater. The watter line is 1/2". That may be too small. When I open up the spigot, the pressure drops and that triggers the heater flame. The shower head is an ergonomic 'green' type with reduced flow to conserve water. That may be a problem. I have two other heads I can try. However, finishing calibration may be the solution since a build up of pressure seems to prevent flame ignition.