Webaware, why use an inverter? You will be loosing at least 10% in efficiency instantly. Get a 12 volt 1/2" bsp threaded diaphragm pump, like a shurflo or similar from ebay for about £40. Thats what I did, and it will pump up to 30 metres head height! My main tank is 12 metres above the wood burner, and it shifts water at 12 litres a minute with ease.
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