3. w hether t he t emperature h as b een c orrectly s et;
4. w hether w ater s urface i s a bove t he w ater l evel o n t he h eater;
5. w hether t ank v olume m atches t he p ower o f t he h eater;
6. w hether w ater c irculates w ell; d o n ot p ut t he o utlet o f t he p ump d irectly t o t he r eading
window o f t he h eater; i f u navoidable, p lease s low t he o w d own.