Bottom three fine black lines - Hot water tank zone valve, recirculate zone valve, and storage tank zone valve
A fire is started a little after 4:00, and temperatures start to climb. At point A, the recirculation valve opens. Very shortly afterward, the EKO controller turns on the circulator pump (not shown on chart). This causes an immediate rapid drop in outlet temperature (heavy black line), and the EKO controller shuts off the circulator
The outlet temperature starts to climb again, and the EHO turns on the circulator again. This causes a second drop, but this time the temperature stays high enought that the pump stays on.
At point B, the inlet and outlet temperatures are high enough, and the TS7260 controller shuts off the recirc valve. This causes a brief drop in inlet temperature, but the temp stays above 140°F, so the recirc valve stays shut.
Neither the top floor nor the main floor is warm, so heat is being circulated through the baseboards (not shown on graph). By point C, the boiler outlet has risen to the point where the EKO controller might drop the fan speed. To prevent this, the TS7260 opens the hot water zone valve, dumping heat into the hot water tank. A little while later, the boiler outlet is climbing again. At about 5:25, the TS7260 starts cycling the storage tank zone valve, dumping heat into the external tank as well.
At point D, the main floor is warm. Heat is still being sent to the top floor, so the boiler temp has to be kept as hot as possible without causing the fan speed to be reduced. The TS7260 continues to cycle the hot water and storage tank zone valves.
Just before point E, the hot water tank reaches the target temperature of about 158°F. The hot water zone valve is closed.
At point E, the top floor is warm as well. The boiler does not have to be kept hot to maximize baseboard output, so the TS7260 dumps heat into the external tank with the exception of a top floor thermostat hiccup at about 7:15.