A vent attachment facilitates attaching a coaxial air intake and exhaust vent of a tankless water heater to a Category I vent, such as B-vent. The vent attachment comprises a first end with a coaxial connector comprising a central exhaust pathway and a circumferential air intake pathway. The vent attachment also comprises a second end with a tubular exhaust vent connector in fluid communication with the central exhaust pathway. The vent attachment further comprises a frame that encloses the central exhaust pathway and comprises a mesh configured to provide fluid communication through the frame with the air intake pathway. Additionally, operation of the tankless water heater is modified to ensure that the exhaust generated is suitable for venting through a Category I vent. The tankless water heater maintains a high fuel consumption rate such that the temperature of hot water produced increases throughout each of a plurality of burner stages.

A vent attachment facilitates attaching a coaxial air intake and exhaust vent of a tankless water heater to a Category I vent, such as B-vent. The vent attachment comprises a first end with a coaxial connector comprising a central exhaust pathway and a circumferential air intake pathway. The vent attachment also comprises a second end with a tubular exhaust vent connector in fluid communication with the central exhaust pathway. The vent attachment further comprises a frame that encloses the central exhaust pathway and comprises a mesh configured to provide fluid communication through the frame with the air intake pathway. Additionally, operation of the tankless water heater is modified to ensure that the exhaust generated is suitable for venting through a Category I vent. The tankless water heater maintains a high fuel consumption rate such that the temperature of hot water produced increases throughout each of a plurality of burner stages.

A combined heat and power system generates energy and efficiently captures a percentage of such energy that would otherwise be lost to, among other things, control the temperature and humidity of a house or dwelling.

A vent attachment facilitates attaching a coaxial air intake and exhaust vent of a tankless water heater to a Category I vent, such as B-vent. The vent attachment comprises a first end with a coaxial connector comprising a central exhaust pathway and a circumferential air intake pathway. The vent attachment also comprises a second end with a tubular exhaust vent connector in fluid communication with the central exhaust pathway. The vent attachment further comprises a frame that encloses the central exhaust pathway and comprises a mesh configured to provide fluid communication through the frame with the air intake pathway. Additionally, operation of the tankless water heater is modified to ensure that the exhaust generated is suitable for venting through a Category I vent. The tankless water heater maintains a high fuel consumption rate such that the temperature of hot water produced increases throughout each of a plurality of burner stages.

An oil boiler according to the present disclosure includes a combustion chamber in which a combustion reaction occurs, a burner including a fuel nozzle that sprays fuel of an oil type into the combustion chamber, an air nozzle that injects air into the combustion chamber, and a spark plug that ignites a mixture of the fuel and the air, an air supply pipe that guides the air supplied to the air nozzle, a duct that releases combustion gas, a heat exchanger that heats heating water by heat from the combustion reaction, and a case that receives said components. The duct includes a flue connecting adaptor to which a corrugated pipe and a flue are connected, in which the corrugated pipe is connected to an inlet of the air supply pipe into which the air is introduced, and the flue releases the combustion gas to the outside of the case.

A thermodynamic boiler for delivering heat into at least one heating circuit, includes a compressor forming the compression function of a heat pump type loop using a compressible fluid of type R744, and includes a fuel burner which delivers heat into the compressible fluid.

A combined heat and power system generates energy and efficiently captures a percentage of such energy that would otherwise be lost to, among other things, control the temperature and humidity of a house or dwelling.

A combined heat and power system generates energy and efficiently captures a percentage of such energy that would otherwise be lost to, among other things, control the temperature and humidity of a house or dwelling.

An oil boiler according to the present disclosure includes a combustion chamber in which a combustion reaction occurs, a burner including a fuel nozzle that sprays fuel of an oil type into the combustion chamber, an air nozzle that injects air into the combustion chamber, and a spark plug that ignites a mixture of the fuel and the air, an air supply pipe that guides the air supplied to the air nozzle, a duct that releases combustion gas, a heat exchanger that heats heating water by heat from the combustion reaction, and a case that receives said components. The duct includes a flue connecting adaptor to which a corrugated pipe and a flue are connected, in which the corrugated pipe is connected to an inlet of the air supply pipe into which the air is introduced, and the flue releases the combustion gas to the outside of the case.

A passive heat recovery or defrosting apparatus features an evaporator, a condenser, and vapour and liquid conveyance lines connected therebetween. The vapour and liquid conveyance lines respectively connect to upper and lower ends of the evaporator and condenser. The evaporator and/or condenser has a ring-shaped body for fitting around or inline with a pipe to achieve heat exchange relation with a fluid passing therethrough. The evaporator is installed on or inside a warm pipe or duct (e.g. waste drain pipe, clothes dryer exhaust duct, flue pipe, or indoor section of a sewer vent stack) at a lower elevation than the condenser. The condenser is placed on an outdoor end of either a sewer stack or air intake duct for defrosting purposes, or is placed on a water supply line or air intake of a hot water tank, clothes dryer, etc. Working fluid circulates passively between the evaporator and condenser.