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I have a client who wants me to estimate of the potential savings a new mod- con could deliver over the dying old slant fin atmospheric vent gas boiler they now have.
The house is 1970's 2x4 construction maybe 35 plus btu/sq. I am planing to propose trv equipped panel radiation sized for 150deg. at design. To replace and in some areas assist the existing base. The user plans significant wood supplement. I expect the trvs to be especially useful in helping to prevent over heating in the rooms effected by the wood-stove. Outdoor reset probably with sensor in non trv'd reference room far from wood stove(automatic curve adjustment). Probably Tekmar 270 paired to TT prestige. Direct piped, (researching smart circulators) 40-50 gallon indirect to replace gas atmospheric tank heater.
General experience seems to indicate that a %25 percent savings could easily be realized by these sort of improvements. However boiler AFUE's don't really prove this level of savings. I have explained the value of building envelope improvement in addition to mechanical improvement, and the variables and difficulties of making absolute predictions of efficiency improvements. I'm looking for some documentation to support the observation that low temperature systems of this nature can realize gains beyond boiler plate percentages.
Any opinions, does anyone think I would be misleading them by suggesting potential gains of this size?