This topic doesn't get much attention in the boiler forums. After searching threads here and elsewhere, most information did not address this concern without including boiler control. There are two simple ways to include outdoor reset while drawing from thermal storage. Injection using variable speed circulators or mixing valves, both controlled by an outdoor reset unit. The cost to achieve this can be $300 US and up. Since my system uses a stand alone wood fired boiler to heat storage, I do not see a need for additional boiler control. The Tekmar 356 is a microprocessor-based outdoor reset control designed to operate a permanent capacitor, impedance protected or equivalent pump at varying speeds. The 356 also provides for boiler minimum protection and boiler operation. The Tekmar 361 is a microprocessor-based outdoor reset control designed to operate a permanent capacitor, impedance protected or equivalent pump at varying speeds. The 361 also provides for boiler minimum protection, system pump operation, and boiler operation. As well, a tekmar indoor sensor can be connected to the control to provide indoor temperature feedback. The Tekmar 356 and 361 fit the bill with additional features that some users would find useful. As you see, they employ the use of variable speed circulators and include boiler control. There is a mixing valve controller option from Armatur that will do the job. They offer 2 models with outdoor reset, the LK110 and the LK130. Both mount directly to a mixing valve and receive input from an outdoor sensor. The LK130 includes input from an indoor sensor. The Armatur LK840 3-way mixing valve or valves from several others will pair with the controller. I have an LK130 controller mounted to a Tekmar 710 valve that work great together. From info provided in the thread, Overnight Steady House Temps, I was made aware of the Armatur unit. The install was pretty simple and the results are a much appreciated good nights rest. The Grundfos 15-58 circulator runs 24/7 on the low setting and keeps things steady on the house side. Two things that could cause issue would be high winds, and solar gain. Both of those can be minimized with the use of indoor feedback. In the case of high winds, I found it necessary to adjust the outdoor reset curve slightly in extreme conditions. In the case of solar gain, I have the Grundfos 15-58 on/off controlled by the houses main thermostat set just above the Armatur indoor thermostat and will cut power to the circulator in an overshoot of indoor temp. Results will probably vary with each system design and emitters used. Members @JohnDolz and @Sparky were very helpful in sharing advice of their experiences with outdoor reset from storage, thanks guys.