Boring sorry immersion heater

[ladymelbourne1926]

Hi I need to replace my immersion heater it's large and in a very old property, can anyone advise me how much replacing and fitting an immersion heater might be? We are literally clueless and the 3 quotes I have vary ridiculously.
Thanks

do you mean a hot water cylinder?

What colour is it, and what size?

Do you have a gas boiler?

Do you use "economy 7" type electricity?

Thanks for replying, it's called an immersion heater. That's what the very old label sticker says on the side, I have 2 water tanks that fill it and then it heats the water. It's a bit of a cobbled together system as it has to fit in a very old listed building.
We have no gas at all here, it's 1metre 20 cms High and cream coloured. I can't find anything on it that tells me the capacity.
It's an ancient system at least 25 years old probably more.
Yes I use a economy 7 electricity plan.
It's leaking so has to be replaced but the quotes I've been given are ridiculously disparate.
Thanks again.

If it's 1200mm high, it's a hot water cylinder. You can call it a turnip if you prefer. An immersion heater is something else, it fits inside a cylinder.

Depending on diameter, a 1200mm will hold about 100 litres, which is enough for a bath.

As you are on economy 7 you need one with an upper and a lower immersion heater fitted to it.

If it is fed from a cold water tank a blue one will be suitable. If you are sure you will never ever have a gas boiler or multifuel, an indirect one will be suitable. If you ever run out of hot water during the day and have to top it up at expensive peak rate electricity, consider a bigger one if there is room. there is not much price difference.

For example
www.screwfix.com/p/rm-1200-x-450-indirect-vented-cylinder/86775
This one is indirect. A direct one may differ slightly in price (not so common now)

If you have good water pressure and flow from your incoming watermain, it may be possible to fit an unvented cylinder and do away with your cold water tanks. This will cost more but is superior and gives a much better shower. It depends on your supply. It will usually be white and made of stainless steel. It is usual to fit a noticeably bigger one.
www.screwfix.com/p/rm-prostel-unvented-direct-cylinder-120-litre/51564

For info, this is what an Immersion Heater looks like
www.screwfix.com/p/tesla-titanium-immersion-heater-element-27/75262

P.s.

Fitting a blue one might take about a day as you can mostly use the old pipes.

Fitting an unvented one might take longer depending how difficult it is to run the new pipes. As they are pressurised it has to be installed and certified by a qualified engineer who has the "G3" certificate. Some gas engineers are qualified. There are more additional parts required. Likely to cost some £hundreds more.