What is the best CH system cleaner

[Zehroni]

what is the best CH system cleaner for system that has not been cleaned for 2 years?
can it be added to a system that has filter installed?
would it open or improve the performance of partially blocked DHW exchanger? if not, how to clean partially blocked DHW exchanger?

 

[muggles]

If it was cleaned properly two years ago it shouldn't need doing again - it should still be clean as a whistle. What makes you think the heat exchanger is partially blocked?

 

[BigSnoopy01]

acid if there is no alu parts in the system. the plate hex will need removing and cleaning with a strong chemical and lots of flushing under a tap. if your boiler case forms part of the combustion seals then you need a gas safe engineer to remove the plate.

 

[Zehroni]

What makes you think the heat exchanger is partially blocked?

the demand for DHW keeps interrupted, i.e. during the shower
the water gets hot then the boiler cuts off then starts again and so on, thus I believe the boiler is over heating . I also put a domestic thermometer on the input and the out put of the DHW heat exchanger the difference in temperature is big. therefore, I believe the HE is blocked and the plate are not efficiently discharging the heat.

BigSnoopy,
when you say strong chemical, can you name some please.

 

[Zehroni]

sorry forget to mentioned that the DHW hex is not part is not part of the combustion seals. It is at the bottom of the boiler and easy to get to. The boiler is Sime super 90, the hex is cylindrical shape

 

[Agile]

the demand for DHW keeps interrupted, i.e. during the shower
the water gets hot then the boiler cuts off then starts again and so on, thus I believe the boiler is over heating . I also put a domestic thermometer on the input and the out put of the DHW heat exchanger the difference in temperature is big. therefore, I believe the HE is blocked and the plate are not efficiently discharging the heat.

As an engineer I cannot work with undefined words like big and small.

I need figures!

To clean a plate HE citric aced is usually used.

I think your HE is one of the cylindrical pot type. They don't take too well to cleaning! But I would not recommend anything stronger that citric acid.

Tony

 

[DP]

Would be looking else where for the problem
Pipe connection to that thing is about 12mm
Do not know what Tony is thinking of when he says it cannot be cleaned; personally cannot think why it should back up on account of obstruction

 

[BigSnoopy01]

citric acid would be ok, i use stronger acids but you have to be very careful, full face mask recommended.

 

[Agile]

I only said they don't take well to cleaning, not that they can't be cleaned.

But I think the outer case is steel and might be corroded by any stronger acid.

The DHW tube is copper I think so safe with citric acid.

 

[Zehroni]

Would be looking else where for the problem
Pipe connection to that thing is about 12mm

do you men this HE is pipe coiled not plate (frankly this is how it was represented in the manual) , if so, would be a dodgy thermostat?

 

[ianmcd]

Your boiler has a Calorifier which is not the same thing as a Plate heat exchanger, yours is sometimes referred to as a DHW heat exchanger but I think you are reading posts that refer to a completely different thing, I have never seen a blocked Sime Calorifier but I live in a soft water country, I think you are mis diagnosing your fault though

 

[DP]

I only said they don't take well to cleaning, not that they can't be cleaned.

But I think the outer case is steel and might be corroded by any stronger acid.

The DHW tube is copper I think so safe with citric acid.

Tony how is the component not similar to a radiator plumbed with copper pipe

I have not had issues using DS40, X800 or X40
If you are using your HeathRobinson ideas using non off shelf chemicals, is there any wonder cleaning a perforating chemical

 

[Agile]

I am not sure what you are complaining about.

I said very clearly that the outer case might be damaged by any stronger acid than citric.

None of those propriety cleaners you listed are stronger acids than citric.

I have never heard of an X40 you listed and think you really meant it to be X400.

But when listing chemicals it is important to get them right. There is a lot of difference between carbolic acid and carbonic acid.

 

[DP]

Tony are you thE P155?
Are you saying you have NEVER mistyped?

If you want to split hair, what is outer case? What you really mean "the containment vessel"
For goodness sake the "outer case" is plumbed with pipe that an elephant could walk through, why would ANYONE want to use corrosive chemicals when X400 would suffice if the unit was blocked beyond belief

Furthermore I would be interested in hearing from anyone on tools who has in fact encountered such a calorifier that needs to be chemically cleaned on the primary section using these Frankenstein acids

 

[Agile]

X400 and X800 are only chellating agents and are not acids.

A seriously blocked outer case would need something stronger like citric acid.

But I have never encountered one that is badly blocked and if I did then I woudl probably replace it as they are not that expensive.

Even my Sri Lankan customers dont let their elephants walk inside their boilers!