Is a unvented cylinder more eco than combi.

We have a unvented cylinder and was wondering if it's more eco than a combi?

 

Still can't find my piece of string.

Have you tried asking your installer?

 

How can we forget,

Plumber struggling with vr66 install vaillant

Discussion in 'Plumbing and Central Heating' started by mrbg07546, 1 Apr 2017.

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Read more: https://www.diynot.com/diy/threads/...h-vr66-install-vaillant.480058/#ixzz4s4My3LO2

The thread date could have some significance

 

What's the issue? It's resolved? It's a A+++ boiler and the controls (vsmart are working) to the nearest 0.1 tempreture. The weather compensation is awesome. I've linked it to my alarm via IFTT so it turns off when I leave the house. I've also set it that when I return home give a 30 minute hot water boost.


Back to the question. I wanted to know if my bills would be less than a combi

 

How the hell can we know that?

 

The technical department of a boiler manufacturer was asked this question on the 29th August, they have yet to reply.
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How was actual effficiency of the [your combi] measured ? The large mass of aluminium heat exchanger has to be heated before any heat energy reaches the water. If the test was for example how much gas was required to raise the temperature of 100 litres of water 40 degs Celcius then two very different results are obtained.
1) the 100 litres are drawn off in one continuous stream. ( heat exchanger heated only once )
2) the 100 litres are drawn off in 20 separate 5 litre flows. ( the heat exchanger cools down while no water is flowing and then has to be reheated )
Which method was used for the test and measurement of efficiency for [your boiler]
Method 1) would give results that the manufacturer would like to see but method 2 is more typical of the operation of a combi gas boiler in a domestic situation.
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Which ( combi or hot water cylinder ) is more efficient does depend on the way you use hot water. The quoted "efficiency" is not the same as performance. A boiler with a high "efficiency" calculated from laboratory test results may perform poorly in a real life installation.

Quite possibly the answer is yes depending on how you draw hot water from the system.

 

Impossible to say, there are too many variables. The only way to get an accurate answer would be to install a combi in your house and compare bills before and after

 

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