Vaillant have noticed a design fault with their ecoTEC boilers,the
problem is that one of the seal around the heat exchanger is not
proper and may malfunction causing other things in the boiler to get
wet,I'm not fully sure about the product notice because I can no
longer find it on their website,I posted this earlier in the year with
a link to the website but can no longer find it.
In message , Ed Sirett
Are you familiar with the problem with the Turbomax Plus where there's a
diode bridge in the loom between the pcb and the gas valve - which blows
a resistor on the pcb, and then on the replacement, and then ...
If not - give me a ring at work
I installed about 20 of the T/max+ units, not one has ever had a PCB
failure that I know of.
The stock faults were the diverter valve on earlier models (the ones with
turquoise knobs) and the APS on some later models.
Getting an APS in stock made sure that no other units I had installed
reads the Boiler Choice FAQ as for combi v stored HW that subject has been
flogged to death beyond all reason. There are a dozen or so questions that
need to be thought about before you can make the choice.
As for vented versus unvented HW store that subject has been thrashed out.
unvented stored HW is not a (legal) diy option.
As for Heatrae Sadia Megaflow versus other manufacturers that is a subject
which I can't remember coming up.
Often in a market there is one company which is better known for a class
of product than all the competitors. So much so that their name is
associated with the product.
hoover (vacuum cleaners), skill saw (circular saw), dremel (modelling drill) ,
martindale (socket tester). megger (insulation tester). jcb (excavator)
This situation can exist for some time until someone realises that ....
"No.2 tries harder".
Finally there are arguments for and against an air pocket expansion unit
versus one with a separate expansion vessel.
If I have an indirect cylinder will the boiler heat the cylinder?
If it does heat the cylinder will it only heat when the central
heating is on?
In the summer is it possible to get the boiler to heat the cylinder
but not to run the central heating?
I do not like using the immersion heater because it pulls a lot of
electricity, in the summer our house gets very hot so about 5 air
conditioners are running,they may be energy efficient but the cost
does add up and it will work out very expensive if I have an immersion
heater and air conditioners running.
The sort with an indirect heating coil are the only sort that a boiler may
heat. The boiler control system is arranged to heat either the cylinder
and/or the radiators independently. See S-plan controls in the FAQs and
the wiki. Y-plan controls may not be used with an unvented cylinder
without adding an extra motorized valve so an S-plan control system is
economically a better choice and technically simpler.
Unless your HW requirement are out of the usual the cost of HW provision
using a modern HW storage cylinder and electricity is quite small
(£1/day?). However it is worth the effort of using the gas boiler to heat
the DHW. Insulation of the primary pipework is critical.