the unit is 18 yo. we had someone come out last Sept, he said need parts but no one has them any more, but he would look. Now is January, he is still looking and not returning our calls. This is the same guy who serviced this unit several times over the years. This time the pilot will not stay on, period. we tried to find someone else to take a look, some did not come out even though it was scheduled, some did come out, looked, charged and could not fix it, did not know this type of unit, etc. The unit, i believe is too small for us anyway, so i figure we need a new one. meanwhile, we have no hot water. My guess if we buy a new unit, there will be more takers to install it, more money in that.