Combustion heating apparatus

A combustion heating apparatus preheater comprising:

• a flue box comprising:
• a combustion gas inlet that receives hot combustion gas from a boiler;
• and
• a combustion air inlet that receives air for combustion in said boiler;
• a condenser comprising:
• a mains cold water inlet;
• a mains water outlet, wherein said mains cold water inlet and said mains water outlet are arranged such that mains water flows through said condenser prior to being supplied to a boiler combustion chamber;
• a central heating water return;
• a central heating water flow outlet, wherein said central heating water return and said central heating water flow outlet are arranged such that central heating water flows through said condenser prior to being supplied to said boiler combustion chamber;
• and
• a plurality of connections that enable said condenser to be connected to preheated fluid supply pipework from a source of preheated fluid, wherein said preheated fluid comprises fluid heated by heat from any of combustion gas or a renewable energy source;
• a combustion gas heat exchanger operative to transfer heat from the combustion gas flowing through the combustion gas inlet to the combustion air flowing through the combustion air inlet such that the combustion air is preheated prior to entering the boiler,
• wherein said condenser transfers heat from said preheated fluid to at least one of mains cold water from said mains cold water inlet, or central heating water from said central heating water return in order to preheat the mains or central heating water prior to entering said boiler combustion chamber, wherein the combustion gas heat exchanger comprises at least one heat rod filled with a fluid, wherein heat is transferred from the combustion gas into the fluid, and wherein heat is transferred from the vaporized fluid to the inlet combustion air by subsequently condensing the fluid.