Vaillant EcoTEC Plus 831 Review

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auldmoaner's review of Vaillant EcoTEC Plus 831

★☆☆☆☆

“The Vaillant EcoTEC Plus 831 boiler was installed as a...”

Written on: 14/12/2008 by auldmoaner (1 review written)

Good Points
I have has this boiler since it was first brought out: over 3 years. It was easy to install and is quick to start and efficient (see below) when working. It also has a number of automations and extra features that may be useful.

General Comments
The Vaillant EcoTEC Plus 831 boiler was installed as a replacement in an existing but expanded system.
As such the system had already some older pipes and these were dirty. Inspite of the system being power flushed a number of times the boiler was unable to cope and broke down a number of times under warranty. The repairman told me to fit a Magna cleasn filter and the system is now clean. However the boiler continues to malfunction. Specifically a sensor repeatedly stops the system working but if reinstalled will work again. The pump lost perfomance and only circulates the lower floors of a four storey terraced house. It has been replaced.


My understanding is that these kind of problems has been similar with a number of other installations.

Generally the system seems to be very complicated cf older systems and not completely sorted. All repairman can do is replace what they are told by the diognostic system. And spare parts can be over 25% of the entire new cost.

Be careful putting it into old systems as it cannot stand the slightest dirt in the system and get a service agreement immediately.

Talking of Service Agreements, it is best to get one that includes the CH pipework because then you don't have to put up with whatever is not included being always the cause of every breakdown.

Efficiency appears to be ok. it only seems to be about as efficient as the boiler it replaces which was one of the early condensing (system) boilers but the layout has been expanded so it is hard to exactly compare.

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Mickeyblueeyes1845's Response to 425068_auldmoaner's Review

Written on: 25/12/2009

I found this review very helpful because...I'm having similar problems with my 3 year old EcoTec Combi Plus 31. It's Christmas day, the heating is working perfectly but the hot water to the taps and shower only lasts about 6 seconds before reverting to cold. So no hot baths or showers on Christmas day. Also a small puddle of water appears regularly on the floor below the boiler these days. I have had it serviced twice. Hopefully the next service will cure the present problems but I'm not optimistic about the long-term performance and relaibility of this boiler. This boiler has been a disappointment to me. I will not buy Vaillant again. I own other properties and will be ordering 2 Baxis soon for a commercial property. Fingers crossed.

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Aaronfehr's Response to 425068_auldmoaner's Review

Written on: 10/06/2010

A system doesn't need to be flushed a 'number of times' only once and to be honest a Magnaclean or any other filter should be installed at the time of installation, which any decent engineer would do. Another case of going with a Bob the Builder plumber.

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