A fluid heating apparatus may comprise a fluid pumping assembly configured to increase a pressure characteristic of the fluid between the fluid inlet and fluid outlet, and a heating assembly configured to heat the fluid between the fluid inlet and the fluid outlet. The heating assembly may define a first portion of a gas path such that exhaust gases from combustion in the heating assembly enter the gas path. The apparatus may also comprise a heat recovery assembly configured to recover heat from the exhaust gases and transfer recovered heat to fluid moving through the fluid path. The heat recovery assembly may define a second portion of the gas path in fluid communication with the first portion of the gas path. An exhaust gas movement device may be configured to pull exhaust gases through the first and second portions of the gas path to the gas movement device.

A pressure regulator assembly including a regulator valve, a spring guide, a spring extending between the spring guide and regulator valve for setting operation of the regulator valve, a sleeve coupled to the spring guide, a spring cage coupled to the sleeve, an adjustment stem coupled to the sleeve, a dial assembly coupled to the spring cage, and an adjustment cap coupled to the adjustment stem, wherein when the cap is depressed, interaction between the spring cage, spring guide and sleeve causes the spring guide to selectively rotate between a normal mode and a fast-fill mode. In the normal mode, adjustment of the cap determines an output pressure. In the fast-fill mode, the spring is further compressed by movement of the spring guide to a predetermined setting to provide a predetermined output pressure.

A pressure regulator assembly including a regulator valve, a spring guide, a spring extending between the spring guide and regulator valve for setting operation of the regulator valve, a sleeve coupled to the spring guide, a spring cage coupled to the sleeve, an adjustment stem coupled to the sleeve, a dial assembly coupled to the spring cage, and an adjustment cap coupled to the adjustment stem, wherein when the cap is depressed, interaction between the spring cage, spring guide and sleeve causes the spring guide to selectively rotate between a normal mode and a fast-fill mode. In the normal mode, adjustment of the cap determines an output pressure. In the fast-fill mode, the spring is further compressed by movement of the spring guide to a predetermined setting to provide a predetermined output pressure.

A storage medium stores a control program including program code for, in the case of increasing a quantity of combustion in the boiler group, after a high-efficiency combustion shift signal that makes the shift to the high-efficiency combustion position is output to all of the boilers subject to high-efficiency control by which control is conducted on the basis of combustion at the high-efficiency combustion position, outputting a control signal that makes the shift to a higher combustion position than the high-efficiency combustion positions for any one of the high-efficiency control subject boilers.

A method for operating a directly heated, solar-thermal steam generator is provided. As per the method, a nominal value {dot over (M)}.sub.s for the supply water mass flow {dot over (M)} is conducted to an apparatus for adjusting the supply water mass flow {dot over (M)} wherein, at the adjustment of the nominal value {dot over (M)}.sub.s for the supply water mass flow {dot over (M)}, account is taken of a correction value K.sub.T, by which the thermal effects of storage or withdrawal of thermal energy in an evaporator are corrected.

A method for operating a directly heated, solar-thermal steam generator is provided. As per the method, a nominal value {dot over (M)}.sub.s for the supply water mass flow {dot over (M)} is conducted to an apparatus for adjusting the supply water mass flow {dot over (M)} wherein, at the adjustment of the nominal value {dot over (M)}.sub.s for the supply water mass flow {dot over (M)}, account is taken of a correction value K.sub.T, by which the thermal effects of storage or withdrawal of thermal energy in an evaporator are corrected.

The present invention relates to a system and a method for providing steam. In particular, the present invention relates to a steam delivery system comprising a thermal energy storage apparatus for heating a flow of feedwater to produce steam at a predetermined temperature and/or a predetermined pressure.