I have a hot water heater and am trying to work out if the 22 liters of oil that will not drain because the lower outlet is 200mm from the bottom. will this become an issue when new oil is added, to the titration results. Or is there a drain on the bottom of the HWS. I can not see one as there is a cover on the bottom. If anyone with experience could help i would appreciate it

Daniel

There may or may not be a drain right at the bottom, but you can make it so.
Cut a hole in the outer casing about 250 mm across. Dig out the insulation material and you may see a bolted on cap. Really depends on the make/model of HWS you have.
If there is a cap remove it drill a hole and weld on an elbow. If there isn't a cap you can still do the same.
Just sit the unit up on 3 bricks or something to raise it up off the floor to allow room got the pipework to run out underneath.

Daniel,
HWS usually have a domed (convex) top and sometimes have a domed (concave) bottom. The sacrificial anode is usually inserted thru a (25mm?) hole in the top.

If you invert the HWS, the domed top, becomes a domed bottom.

If you use the HWS upside down you can use the Sacrificial Anode hole with a ball valve to allow complete draining of the HWS. If the element is half way up, this will not be a problem, but if it is at the bottom, you may need to heat the oil external to the HWS.

Some HWS have 2 elements, one at the top and one at the bottom, to allow the whole lot to heat off-peak, and just heat a little during peak periods. If yours has 2 elements, choose the element which is lower, when the HWS is inverted.
I hope this helps,
Tony

The HWS has a dome shaped bottom and a cap that is held in by 6 bolts. So I have welded a 3/4 steel fitting to it and will drill through it.
When i took the cap of it had what I could only describe as barnacles on it.
Thanks for your advice Tony And Qwarla.

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That's the stuff.
Don't forget the anode as Tony mentioned. That is in the centre top. Makes a good return hole. If you don't need this, remove the anode rod and plug the hole, as you don't want the zinc in the reactor.