Good evening: Hope I can get some help on this one. I have a commercial booster heater with 6ea. new heating elements that are 6KW each and total 36KW. We are having a problem with it making and maintaing the final rinse temp of 180 degreese. It is designed to make or have a 40 degree rise over the incoming water temp. Problem is, when the water from the hot water heater is 95 drgrees, it goes up 40, like it should.. When the water from the hot water heater is 130 it goes up 55-60 degrees.. My question is does it take more energy to heat water from 95 degrees than from 140? Or, can someone explain how sometimes the booster heater gives us more than a 40 degree rise? I hope I can find some help on this one and thanks for any and all help in advance. Take care Dan

I just had a burnham PVG installed and had a few questions. I have two zones and he will be installing an indirect next week problem is for some reason he was trying to hook up a zone controller it was a taco sr503exp so i can have priority for indirect problem is he said it can't be done inless he or i run new 24 volt wires to thermostat which would be nearly inpossible without lots of damage. Thermostats i have now are 120v and i think he was saying that he needs another common wire from at least one thermostat or something like that. Is there any way around this? Is there any other way i would be able to get priority on indirect without the zone controller or having to replace the wiring? Right now he has the wires which are coming from the wall connected directly to circulators he said they wired thermostats hot which works like a wall switch. he said i can leave it like this but will not have priority on indirect. He says i might be able to get away without priority because i have an output of 120,000 btu's but i would rather have priority. Next Question Plumber told me that if he installs switching relay boiler could be cold start. Is this a good idea? Was this boiler designed for Cold Start? Is it better for it to maintain temperature?