Method of providing auxiliary heat during primary heat pump lock

Method of regulating a central or district heating plant by mean

Method of setting the output of a pump

Microprocessor based controller for heating system

Microprocessor controlled heating system

Microprocessor controller for diesel fuel fired heater

Minimizing off cycle losses of a refrigeration system in a heati

Mixer valve for heating installations

Mobile boiler house

Mode selector for a heating system controller

Motor vehicle with a combustion engine

Multi-phase modular comfort controlled heating system

Multi-section evaporator for use in heat pump

Multi-stage boiler staging and modulation control methods...

Multi-type air heating apparatus utilizing phase variation of he

Multimode heating system and method for heating

Multiple temperature control system for an automotive vehicle

Natural draft water heater

Off-road heating control

Oil burner control for hydronic system