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Hello forgive me if this is mentioned elsewhere but I could not find it if it is. Currently my hot water comes from the engine via a calorifier it's a twin coil so I plan to link up to the heating system when I fit a stove with a back boiler in the spring as all plumbing rads and expantion tank are already in place. I was originally going to put a solar water heater in line as a friend made his own and found it very successfull but it would have ment disconnecting either the engine feed or the stove feed or having an elaborate system of valves and stopcocks so that I was not heating the world via the solar collector on the roof. So plan b as I've recently upgraded my solar panels I have been left with three 190 watt 36 volt panels that are sitting redundent one that has broken glass due to a poor tree felling exorcise. My plan is to put two of these panels in series 70 volt total and connect them to a suitable heating element for the calorifier so sunny days will result in water heating which is what needed for the summer as stove will not be running. I could just link up the element to my current solar controllers load function so when the batteries are charged the eccess would go in to water heating but I wanted to keep the systems separate in case something went wrong and discharged my bank. That why I've decided to use two of the currently redundant panels to keep the systems seperate. Now my question is (sorry if this has been long winded) what's the best way to go about it do I use a second controller and it's load function or the more simpler way just connect panels direct to the heating element with a inline stat to cut power when water temp is achieved in my head the panels direct with a stat seems the cheapest and simplest way to go about it. The thing I'm lacking is the know how so if anyone is currently using this system or can throw any ideas my way as how to wire this up it would be awsome. Cheers gary