We live aboard. We have a head
that burps gas a few times a week. We use a powerful tank bubbler for 20 minutes every hour on a timer so I think this is coming from residual in the lines and Electrosan. However, last week our bilge alarm
went off (we could not figure out what was wrong and it was very periodic, so we have had to turn it off) The last couple of days we have actually detected a gaseous smell. Is it possible for methane from a head
to accumulate over time in such concentration it is dangerous from an explosive perspective? We are on a catamaran
with bunks up high in a well ventilated cabin
so we have not been as concerned with breathability .. although at this point we are beginning to get so.
Today we are going to use evacuation fans on deck
with hoses to the bilges to vent the boat. We will also be turning the alarm
back on and not staying on board if it persists ... but we still wonder if methane could cause this.