maxpower_454 wrote:Anyone currently using one? Why were they discontinued? Is it a good boiler? I know Keystoker boilers are usually excellent but did they ahve problems with this one?
There is nothing wrong with that model boiler that I have heard. I looked in my old manual and the K-4 is rated for 96 MBH gross and 67 MBH net.
Keystoker came out with the KAA-2 with a rating at 90 MBH gross and 76 MBH net. It was a smaller, more economical boiler for lighter heating load applications. There was no need for the KA-4 model anymore because it cost more than the KAA-2 and had about the same output.