Hot water cylinder temperature
- Thread starter MattChan
- Start date
it works but you have to make sure you flush it well out afterwards 
stat is too low as softus said 
[quoteThe instructions on the Fernox site imply that it goes in the sanitary water bit of the cylinder? [/quote]
It's not illegal (so long as you don't allow it to back syphon to the mains supply) but in practice pointless. Hence chemical cleansing is really for CH side. If you see the scale when a bad cylinder is cut open, lumps the size of Mars bars. Imagine trying to strain whatever solution created through the water outlets or drain offs. A new copper cylinder is not expensive and its quicker to fit that what you're proposing.
It's not illegal (so long as you don't allow it to back syphon to the mains supply) but in practice pointless. Hence chemical cleansing is really for CH side. If you see the scale when a bad cylinder is cut open, lumps the size of Mars bars. Imagine trying to strain whatever solution created through the water outlets or drain offs. A new copper cylinder is not expensive and its quicker to fit that what you're proposing.
Just had a look at the stat on the hercal cylinder at our lasses house and thats in the same place as mine as is this one I found on tinterweb
Is the hole for the stat cut by the manufacturer or have they all been done by the same dodgy installer?
Is the hole for the stat cut by the manufacturer or have they all been done by the same dodgy installer?
Sorry I missed that bit...
Yes it appears that the base of the stat is touching the cylinder. I've had a thermo couple held right against the cylinder and tested the cal on the stat v cylinder external temp and its within 3 degs or so.
Yes it appears that the base of the stat is touching the cylinder. I've had a thermo couple held right against the cylinder and tested the cal on the stat v cylinder external temp and its within 3 degs or so.
Took the immersion heater out today to investigate the inside of the cylinder... Inside the walls show no signs of lime scale. The inside is copper in colour with green pitting.
The heat exchanger was covered in limescale at some point but you can see where this has fallen off in places as huge bits are lying at the bottom of the cylinder. Then right in the center of the cylinder in the base there is something covered in scale that looks like its L shaped and pointing towards one of the sides.
How long do these cylinders last? Its been in 8 years.
I'm moving my bathroom / airing cupboard around so if its due for replacement I will stick a new one in when I move it all around...
Whats recommended to replace it with? Any makes to stay clear of?
Thanks for the help
Matt
The heat exchanger was covered in limescale at some point but you can see where this has fallen off in places as huge bits are lying at the bottom of the cylinder. Then right in the center of the cylinder in the base there is something covered in scale that looks like its L shaped and pointing towards one of the sides.
How long do these cylinders last? Its been in 8 years.
I'm moving my bathroom / airing cupboard around so if its due for replacement I will stick a new one in when I move it all around...
Whats recommended to replace it with? Any makes to stay clear of?
Thanks for the help
Matt
OK - it's in good nick then.nusku said:
This is known as a sacrificial anode - it corrodes instead of the cylinder.
Your in Lap of the Gods territory. I've known them go in a couple of years, and others last more than 25. If the rest of the system is maintained properly, and the boiler thermostat kept at a reasonable level, then it'll go on indefinitely.
Not necessarily a bad idea, if your budget can cover it.
Softus said:
I thought that may be what it was! It was covered in scale and white! Are the made of aluminum?
Is it best to get all the large chunks of scale out through the immersion hole or just let them be in the bottom?
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