| http://www.w3.org/ns/prov#value | - The variable output heating system of claim 13 wherein the control algorithm adjusts the firing rate to a current firing rate (CFR) which is a previous firing rate (PFR) plus a factor derived from a comparison of the previous thermostat on and off times including at least one of comparison of a previous thermostat duty cycle to a preferred target duty cycle and a comparison of the change between v
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