Check the listing for details. Pump Assembly Complete System, Temperatur-Differenzregler U. High Efficiency. Color: Gray, Width: see description, Condition: New, Made in Germany. Listed at 568.90 USD. ENVIRON MP500 is the controller with brains! It offers everything your water-bearing stove or wood-fired boiler needs for safe and long-term system operation, as well as intelligent charging and discharging of your heat storage tanks. ENVIRON MP500 monitors and controls water-bearing stoves or wood-burning boilers with one or more storage tanks. In addition to storage tank loading (P1), the controller also intelligently loads and discharges several buffer tanks. Furthermore, it assumes important system monitoring and security functions. System parameters and measured values can be viewed and changed via the LCD display. ENVIRON MP500 has five inputs for temperature measurement and four outputs for controlling the boiler pump, solar pump, buffer management pumps, etc. The equipment of.