Hi all, it's 0 degrees this morning with a -15 windchill, all 4 zones calling for heat. Before I replaced the 50 plate heat exchanger with the 100 plate, the temp in the oil boiler was hovering around 130/140, this morning is no different, it's still hovering around 140. So, I'm thinking that fireboss may be on the right the track regarding changing out the Grundfos 26-99 between the oil boiler and Hx. The pump between the oil boiler and Hx is set at the number 1 position. It's a 3 speed Grundfos. Should I up the flow to the number 2 position?
Fireboss - How's that NRF25 doing for you? Is it still giving you the results you stated earlier this post? I have to plead ignorance with a lot of this pump/flow stuff, I'm not that educated when it comes to hydronics and flow vs head pressure.