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[RSI]

A bronze pump in not required. The chemicals in the boiler will protect the pump just like they protect the boiler.
I bet close to 99% of the people here are running cast iron pumps.

[sumptersmoker]

Love this post.. I wish it had just a little more picture and details. because I have purchased a 20 plate and was wanting to install it for my dhw . Even after reading all of these post.  I still am confused on how to plumb these crazy things... I guess Ill need pictures or a diagram..lol   I didn't think i was that dumb...

The sumptersmoker 

[RSI]

PM me your email addresses and I can send some diagrams.

[gandgracing]

I've got another concern after adding this plate to heat the house water. Last year I could go 24 hours on one loading all through the winter. Right now it's been in the 50 and 60's and the furnace is hardly running at all but the stove is not holding temp like it use to. Could using that 10 plate be hurting me that bad? 

[boilerman]

Heating domestic water typically draws verly little heat off the water and creates minimal wood usage. Is it possible you are losing heat in the ground with your water delivery lines?

[gandgracing]

I didn't have that kind of problem in the past. And it's not really cold out.

[boilerman]

Not unless your lines have soaked up with water. Ground temps where lines are buried could still be 50 degrees or less. That would draw heat off. What kind of line and insulation system do you have in the ground?

[gandgracing]

1" lines that are wrapped with the foil insulation about 3 or 4 times I think.  And are in a 4" black pipe.

[willieG]

if you never had a problem before and you are sure you are not losing heat to the ground through your OWB supply or return lines as asked by others, have you checked to make sure your cold water supply from the house is not siphoning backwards and you are sending btu's back into the ground through your cold water supply. (does your cold water ever feel warm when you use just the cold water tap?)  i don't mean siphong water backwards...just heat moving through the lines backwards (the cold water line acting as a heat sinc?)
when no hot water is being used it is possable for the standiing cold water in the domestic supply line to draw heat in reverse.

[boilerman]

Don't write off the possibility that your water line delivery system has filled with water. I've seen your style system fail many times after about 2 years of use without an issue prior. If you lose 15 degrees in the ground coming in to the house, you lose another 15 degrees going back out the the owf. How old is your system?