Im looking for better performance from my system, I dont have a clue as to how to find the right pump...ive tried to get the "head" but havent yet.. I did figure out that i have 220ft of 1" pex and i have an additional 33 ft based on the chart,90's and ball valves,2 tees....but what about the HX? Unfortunately the chart is for radiant heat where the flow is in a simple loop.....the hx would be a variable depending on how many plates,the brand,and if its got buildup inside....I have the stock armstrong circ my Shaver came with,and i tired a taco 007,and I think i need a little more oomph,I am dropping 30-40 degrees at times below the outside temp....when all 3 circ zones are on..Id like to cut that number back to 15-20 degrees..thru my 1" lines,and 50 plate HX...(which i cleaned this yr with white wine vinager for 4 days......I was thinking of the taco 009 or 0011,theres 2 different 0011s one is designed for more head mediun flow(it has a large motor),the other looks like a slightly larger 007 and is 50 dollars cheaper and is designed for high flow with little head....i wish i had a clue what i needed.