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Blocked Heat Exchangers..
Do you have fluctuating hot water temperature? Does the shower run luke warm then hot, luke warm, then hot again?
If so, then I can probably explain why...
Once the boilers been installed, residual magnatite or rust particles get loose from the old radiators, and get pumped into your nice new boiler.
They then collect in the narrowest parts of the boiler (hot water plate heat exchanger) and stop circulation.
We’ve replaced 3 boilers this year, less than 4yrs old, that were powerflushed, dosed with inhibitor, and commissioned in accordance with the manufacturers instructions..... VERY EXPENSIVE!
All three were completely wrecked by this problem.
Because? they didn’t have filter protection fitted.
In two cases, the whole main heat exchangers were completely trashed. Once again, powerflushed and treated on installation. Complete waste of time!
And these parts ARE NOT COVERED BY YOUR WARRANTY
This problem drove me nuts when I worked for Vaillant, and it still does, because it’s so unnecessary!
Everyone blames the boiler, and it’s giving Vaillant a really bad name. The fact is, it’s not a boiler problem, it’s a boiler problem caused by poor advice from installers, and a willingness to pay peanuts by consumers.
Powerflushing has it’s uses, don’t get me wrong, but it’s very limited to the actual longevity of the boiler and system.
But ALL NEW BOILERS require filter protection, and inhibitor, especially high efficiency condensing appliances.
If you don’t believe me, you’re more than welcome to accompany me for a week, and explain to people why their boiler’s costing them hundreds to fix, when it’s only a few years old.
It’s like ‘groundhog day’ 7 days a week! complete madness......
Now, there is some light at the end of the tunnel. A few companies have addressed this problem extremely effectively.
A sample of what a filter collects in a 12 month period.
A sample of filters on the market today.
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