Do gas fired storage combi boilers store the water at high temperatures like say 75C? and if so do they have a internal TMV?. when the storage runs out presume they then just carry on like any combi boiler?. Do they allways store DHW and not primary water?. Oil fired combis probably are all storage type otherwise they couldnt flow low DHW flowrates since they can't modulate and store primary water like the one below, the also generally specify the total vol of HW available until storage depleted and presumably can then continue sypplying DHW as normal.