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It's so simple it can't be true so I really want to get another opinion on this system that I have dreamt up. I have been looking into solar systems but aren't really practical for heating cause obviously you don't loose much heat when the suns out. So on to LPG. Will this work? now the Instant hot water boiler is a low pressure unit and I don't know if I understand it properly but it runs on / below 12ltr p/min has inbuilt temp control (with LCD) to set at perfect levels and from what I gather an inbuilt turbine to run the display and ignition source. what I'm guessing is that If I run water through it constantly or on a set timer VIA a pump at least 720ltr p/h (as long as it can pump the height of the unit) it should measure and adjust according. the stats of the unit are as follows: * Stainless Steel Panel * Low Water Pressure Starting. Fire & Water Separate Regulation * Over Water Pressure Protection Device * Anti Dry-burning Protection device * Over heat Protection & Anti Frozen device * 20-Minute Timer Is Optional Exhaust Way - Open Flue Type & Force Exhaust Type Ignition Mode - Automatic electrical pulse ignition. Use Gas Type - Liquefied Petroleum Gas(LPG) Rated Gas Pressure(Pa) - LPG:2800Pa Energy efficiency - 84%-87% Suitable Water Pressure(Mpa) - 0.02~~0.8Mpa Heating Status - Heating time <=15 Seconds; Over Temperature <=2c; Stability Time:<=15 Seconds Connection Pipe Specs - Water Inlet: G1/2" Pipe; Water Outlet: G1/2" Pipe; Gas Inlet:G1/2" Pipe; Rated Heat Input Power(KW) - 24KW Rated Water Output(T=25c)L/Min - 12L Product Dimension(MM) - 620×340×180 Packing Carton Dimenision(MM) - 750×390×240 The only thing is the rated water output - (T=25c)L/Min - 12L which I gather is 12ltr p/h @ a max temp of 25c so will I have to lower the flow to achieve a higher temp? secondly cause the unit isn't designed for this type of application will the unit be constantly burning while the water is pumped through or will it only burn when the temp is down? And how bad is burning copper when it comes to adding minerals into the water? any way here is a link to the actual product Wholesale 12L GAS TANKLESS INSTANT HOT WATER HEATER LPG STAINLESS, GOOD QUALITY