Electric boiler/immersion only heats half a tank..

Joined
10 Dec 2005
Messages
16
Reaction score
0
Location
Leeds
Country
United Kingdom
Hello, I live in a house with no central heating.

Our hot water is provided via a copper boiler about 5ft tall and is heated overnight when the electric is on low rate. its on an immersion switch which is alway on.

Anyway, about a month ago we stopeed getting hot wate, so I replaced the thermostat. This didnthelp, so I went to change the immersion, I couldnt get this off because it was completley corroded on.

In the end I ttok the whole thing out and went for a replacement from b&q.

My old boiler had an immersion that ran right across the bottom of the boiler. The cold water entering at the bottom. The man at the DIY store said you can no longer get this type and sold me a different style, this one has an immersion that enters from the top and goes about half way down the tank, however the cold water still enters at the bottom of the tank.

The problem is the water only heats down to where the immersion heater goes and the bottom half of the tank is cold.

Ive messed with the temperature and can only get a full abth if the water is about 75 deg then topped up with cold.

Is there a way around this? have I been sold the wrong system for our needs?

Any help greatly appreciated.

Thanks.
 
Sponsored Links
Joined
24 Jul 2003
Messages
24,298
Reaction score
1,416
Location
London
Country
United Kingdom
It's possible to get tanks with horizontal immersions but you have the result of a quest at B&Q. The best you can do without replacing the tank is to use a 30" immersion, as they're the longest you'll get.

You could stir the contents of the tank by using an Essex flange and a secondary circulation pump, but the pump would probably cost more than a new tank.
 
Joined
8 Oct 2003
Messages
7,092
Reaction score
549
Location
Bristol
Country
United Kingdom
Yep fraid so, a 60" cylinder with a 27" immersion element is only going to get up to temperature in the top 50% of the tank due to heat rising. B&Q have have mis sold it to you though if you fully explained your needs so it may be worth writing a letter to them. Horizontal immersions are still widely available, an economy 7 cylinder without them would be a bit of a waste of time.
 
Sponsored Links
Joined
8 Oct 2003
Messages
7,092
Reaction score
549
Location
Bristol
Country
United Kingdom
well it will heat 60 % of the tank rather than the 45% you have now (presuming the tank was supplied with a 27" heater).
 
Joined
10 Dec 2005
Messages
16
Reaction score
0
Location
Leeds
Country
United Kingdom
Hello,

my new immersion arrived, but I cannot get the existing one off now, is this because I put it on too tight or because there is water in the tank?

Do I need to drain it?
 
Joined
28 Jun 2005
Messages
21,669
Reaction score
2,015
Country
United Kingdom
Leave the water in and the feed valve to tank open.then crack the immersion undone with a long handleed spanner or stillsons....once started- then drain some water and remove fully ;)
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Top