Moving into a house heated by LPG - calculating remaining LPG in tank

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Just about to buy a house heated by an LPG heating system. A new experience for me.
Seller is wanting to negotiate a price for the remaining fuel in the tank.
I've offered to pay for the fuel at the current rate given by the current supplier which is 36.9ppl. 600 X 0.369 = 221.40 (£220.00).
I understand that there is a gauge that should only be considered a guide as it works in a similar way to a cars fuel tank.
I'm told it is a 1200ltr tank, but i'm also told it has a 1410ltr capacity!! I'm assuming until proven otherwise that its max contents should be no more than 1200ltrs giving 210lts of expansion etc.
Then i'm being informed that i need to ascertain the “water capacity” of the tank from information on the data plate!
The current supplier says "The tank at <The Property> should have a 100% capacity of 1410 ltrs".
How do i and the seller fairly work out what the fuel in the tank is worth?
Is it fair to say if it's 50% full then i'll pay for 600ltrs at 36.9ppl?
Water capacity......... do i assume that these tanks have an amount of water build up that sits either at the top or bottom of the tank to factor in????? Or is water used to measure the capacity of the tank?
Is there a formula to work out what the tank is holding. I'm assuming that there are only three accurate readings, Full, half way and empty. Anything in between is inaccurate because of the circular shape of the tank.
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Water capacity = the amount of water the tank, as manufactured, will hold (to a specified point/level). Home Bulk LPG storage tanks with a gas capacity of 1200 litres (1410 water capacity) or 2000 litres (2400 water capacity) are common.
A full tank occupies 85-87% of the tank space at a maximum (safety/expansion/pressurisation reasons). Just the same as a small lpg gas bottle for a BBQ!
Many house sales don't bother charging for the LPG or oil in a tank (nor coal/coke/wood in a store) - it's usually <in the noise> of any house sale price. There's no way that the owners can take it with them so if you call their bluff and say "no thanks"...
The gauge is the only indication of a liquid level in an underground tank. I don't know if they calibrate the meter to show gas is "full" at 85% of the water full mark or not (it would be possible)? The bulk lpg thread may shed more light if you read through it?
Above ground tank: if gas is being drawn off at a high rate you might see a line of condensation from the air, where the top of the liquid LPG sits.
My heating is running again today, as it's cold this April so their gas level is dropping daily (and a tank level gauge will vary with temperature, too).
NB bulk lpg gas price (and oil) is almost always quoted as ex (5%) VAT. It also varies a lot region by region and supplier. Do shop around and get a good deal once you move in!
In the end if they are charging a reasonable amount for stuff, that you specifically want, then by all means have it otherwise get them to take it away as you dont really want the hassle of getting rid of their rubbish.
If nothing doing then I'd be asking for appropriate redress for being saddled with an unwarranted and partially serviced boiler.
Maybe consider having the tank filled to capacity and pay for the difference,that'll give an accurate enough measurement of the already present gas amount,satisfactory to you both.
Does seem as if she's being unnecessarily petty,dont get landed with any junk you dont want and ensure anything she wants is taken with her,not left for you to dispose of.
I previously owned a LPG Landrover it's fuel gage was calibrated to display 100% full when the LPG tank was filled to 80% capacity,50% full at 40% capacity,and so on.Imagine the bulk tank will be the same with the shortfall being unusable to allow for expansion,although I couldn't swear to it as being 100% guaranteed.