So, if I run the inlet of the electric DHW tank through an EFM coil to heat the water up as it enters the tank, will this cause any negative effects to the stratification of the electric tank? As the water going into the bottom of the tank will most likely be hotter than the water at the top of the tank, causing the water to turn over within the electric tank?
Also, is a mixing valve recommended because the water going from the boiler to the DHW tank could be greater than 120 degrees?
If I have this setup and do decide to shut the boiler down for any reason, is it okay to have the cold well water going through the coil still? I am afraid of it causing condensation as the well water would cool down the boiler water quickly. I know it can be dangerous to have valves in any line that would restrict flow through this coil as pressure could build up in the coil and pipes if it was valved off and the boiler was operational.
Another option I have seen is to run a small bronze circulator to heat up the electric tank, with the control being an aquastat, so you get a tank temperature of 120 degrees. Using this method it seems you could avoid the mixing valve, but you have the pump and aquastat to add, so it seems just running the inlet of the electric tank through the EFM coil is much simpler.
Finally, are any brand of mixing valve more robust than the other...I don't see too much of a price difference but if one brand is easier to service or lasts longer than another brand that would be good info to have. The water is ran through a softener first so hopefully build-up will be minimized....but these same copper lines had hard water running through them for 30+ years.
For safety's sake, I would like to put a strap on aquastat on the coal auger to interrupt power to the stoker. I think any strap on type aquastat with a high limit circuit would work correct? Is there a different way to approach this same problem? I had a CO sensor go off a couple months back due to a fines bridge and my girlfriend has been a little spooked on the boiler since, even though I had it fixed and was back running without even losing the fire.http://www.pexsupply.com/Honeywell-L600 ... -1738000-p
It looks like forum member Pacowy (who I also got the boiler from) has some coils and I will be getting one off of him, so I should have the boiler back up and running sometime in the near future....and hopefully I don't have to shut it down for a long time other than cleanings.