Just want to provide an update. We are returning now to Missouri from Arkansas where Lloyd De Gerald replaced our Aqua Hot. Cost was $8,540. One place I inquired quoted me $16,600 and others were upwards over $10k. Anyway, Lloyd replaced our old Hydra Hot that used glycol antifreeze with a newer rebuilt version 450 DE that uses boiler antifreeze. It comes with a one year warranty, labor and parts. Lloyd did a great job and thus far we are happy. GO CHIEFS!!!