instead of making deuterium oxide evaporate and break saves by other things it can use electrolyz for make it posible to get deuterium gas and after burn it with oxygen to get deuterium oxide back

deuterium gas can go fusion at 1000 celsius under 10 pressure or at 2000 celsius under 0 pressure 
it will create with fusion at 1000 c 2000 heat and some nble
fusion 2k celsius will create 4k heat and some nble

tritium oxide - trox can turn into tritium gas and oxygen by electrolyz
goes fusion at 600c and 10 pressure and releases 3000k celsius heat and some nble 
fusion at 1500k celsius will create 5000k celsius heat and some nble

D+T fusion reactions
deuterium + tritium will go fusion at temperature of 500 degrees and 50 pressure and release 6000k celsius
deuterium + tritium fusion that happens at 1500 k celsius and no pressure need for fusion will create as many heat as oxygen fusion and maxium pressure

fusion of those elements needed only at low temperatures but when temperatures are higher they will release more energy and will work without any pressure

and also it wont break any save in tpt because it dont changes deuterium only makes it posible to do electrolyz of it and also adds tritium oxide and tritium