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Bosch Greenstar Combi 151 ZWB42-3A
I recently installed a Bosch Greenstar Combi 151 ZWB42-3A boiler along with a radiant heat setup and I had a few questions that I was hoping you guys here could answer.
- I turned on the ECO mode and was curious what exactly that did. I thought it would turn off the circulator pump when heat wasn't being called but it was still be circulated.
- When the thermostat calls for heat the boiler is actually firing 42% of the time and when the thermostat is not calling for heat the boiler is actually firing 4%, does that seem normal?
- When the thermostat is not calling for heat the pump in the boiler is still running and is maintaining the primary loop but is that really necessary? Is there a way to only run the boiler pump when the thermostat is calling for heat?
- When installing this system I had a heck of a time tightening the 1" copper supply and return lines to the boiler without leaks, there is still a small leak on both supply and return, it seems as though the fittings on the boiler were not NPT but rather straight and did not make a seal, is there a special fitting I should be using against the supplied fittings in the boiler?
- When it finally heats up here in North West PA I was planning on redoing those leaky 1" supply and return lines but I also use the boiler for domestic hot water, can I turn off the radiant heat and service those lines while still using the DWH?
- I am planning on adding two more zones but I'm unsure of how exactly to control it. I have a valve on the supply and return to hook into just not sure if I can use the pump I already have or if I will need another one or what?
- I used to heat with a furnace and heat water with an electric hot water heater and now that I've switched to the boiler for everything it seems as though I am consuming a lot more propane which I expected some because of the hot water but I didn't think the hot water would cause that much usage. I usually have to fill my propane tank twice per year and this year will probably be three times.
- If I decide to switch back to my electric hot water heater do I need to do anything on the boiler or just shut off the supply water?
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