this can vary such a lot depending on the length of hose your using and how cold the ground is, this winter i had the water leaving the van at about 65 degrees but by the time it had ran through 100 metres of hose on a freezing floor then it was only look warm at the brush head, if most of the hose had been on the reel then this would of probably been to hot and would of caused the glass to break so when i wasnt using all the hose i turned the heat down accordingly, normaly in summer i have it leaving the brush head at about 35 to 40 degrees