Tonight I improved the bubbler of my renault tractor I put an air diffuser in the bubbler with holes of diameter 6. Complete the insulation of the bubbler.
If you bubbler lack of heat you can heat the air before entering it, It should not be forgotten that even if the water would be at 95 c the simple fact of passing air in the water accelerate the evaporation, water cooled considerably.
a bubbler needs an energetic heating (not only to evaluate the few liters of water of its capacity)
the bubbler needs a certain heat above the water level, like the system of Deutz tractors.
In general, there is a lack of heat in a bubbler heating with LDR
often the exchanger with the coolant is built too rudimentary, a reheating to the exhaust well dimensioned and more efficient.
(there is other way to heat the water than in a bubbler)
Andre