Leon82
Member
I would not go that route for the same reasons the guy in this thread has been trying to remedy.
http://forum.heatinghelp.com/discussion/157589/taco-vt2218/p1
http://forum.heatinghelp.com/discussion/157589/taco-vt2218/p1
Thanks Dana,Setting a smart pump up for delta-T mode on a direct pumped mod-con boiler would usually be a mistake. The constant pressure approach should work pretty well with three parallel zones and zone valves, and would use 10% of the electricity of a manifold-full of Taco 007s. With a cast-iron boiler the 007s are fine due to the low duty cycle of operation, but when you dial in a mod-con the pumps would run almost continuously (and with the Taco-007s, at a very low delta-T when operating at condensing temps.)
Setting a smart pump up for delta-T mode on a direct pumped mod-con boiler would usually be a mistake. The constant pressure approach should work pretty well with three parallel zones and zone valves, and would use 10% of the electricity of a manifold-full of Taco 007s. With a cast-iron boiler the 007s are fine due to the low duty cycle of operation, but when you dial in a mod-con the pumps would run almost continuously (and with the Taco-007s, at a very low delta-T when operating at condensing temps.)
Would it be worth it and/or possible to replace a standard 3-speed internal boiler circ pump with an ecm version?
Could you provide a link to the study? Sounds like it's worth reading.At the beginning of the thread there was discussion about two boilers that have different high end capacity, but modulate back to about the same capacity. The question was whether there is any disadvantage to buying the higher capacity. I don’ t know if all boilers go to highest capacity and then modulate back, For those that do, I read a study that might be enlightening. It has real fuel us data and compared the same system with the highest firing locked out and with that available. The highest fire locked out mode resulted in lower fuel use and heated the home just fine.
The Lochinvar Knight Boilers have a true 7-day programmable night setback feature for both space heating and for DHW tank, but- they're 2x the price of the HTP units- and they require P/S piping with the requirement of an additional system circulator (plus CH circulator, plus DHW tank circulator).If said manufacturers provided a set back recovery mode vs. making you use the flat out 100% output, anyone could use set backs efficiently. I believe that some boilers can approach that if you tweak the settings, but I’ve not seen any discussion of links to better thermostats that would allow them to distinguish a set back from a deficit.
This is awkward, but...
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