EWD heating

[driftoz]

im looking at getting an eastern water dragon soon been reading some care sheets and stuff, reptile shop told me to have basking temp around 28*c and the caresheet said between 30-35*c which one is better? plus for young EWD do they need heat 24/7 like hatchling snakes or just for the 10-12hrs a day and none at night? or if i can get a thermostat with night time temps and keep it at the 20*c range?

thanks peter