Greenstar system boiler with Easy Control on s-plan modulation capability

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needheatnow

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My old system boiler (16yo) is setup in S-Plan configuration. I want to get a new Worcester system and Easy Control (finer control with modulation/condensing.) I understand DHW has to be heated to over 65deg but I would like my heating flow temperature to be much lower particularly in the summer (55deg). Does this require the bosch diverter valve kit to achieve this?

Some suggest it can still be achieved if you don't run CH and HW at the same time and others have suggested that it can be done with the Easy Control adaptor. I am not convinced

Can anyone clear up what I need for my use case of low flow temperature whilst ensuring the DHW meets the regulation temperature?

Additionally, does the diverter valve essentialy create a 2nd circuit and will allow you to control the separate water temperatures or does it serve an additional/other purpose?
 
Last edited:
I got a reply from the manufacturer and they confirmed that an Integral Diverter Valve would be required to split the Heating and Hot Water to take advantage of modulation on the heating. I Hope, this helps others who might be looking to specify their requirements.
 
needheatnow said:
I got a reply from the manufacturer and they confirmed that an Integral Diverter Valve would be required to split the Heating and Hot Water to take advantage of modulation on the heating. I Hope, this helps others who might be looking to specify their requirements.
Click to expand...

Thanks for the informative answer.
This was mentioned by me yesterday on another thread and got the same silence this thread did .
Clearly, the industry hasn't much interest in it (or likely understanding of it) which isn't a surprise.

Which is surprising to me, I'd have thought it very important.

So is this diverter valve an option or std fit?

If it's an option, it makes an absolute mockery of the condensing boiler laws imho.

I'd be interested in further updates if you have them :)
 
needheatnow said:
Can anyone clear up what I need for my use case of low flow temperature whilst ensuring the DHW meets the regulation temperature?
Click to expand...

In the case of a Vaillant with Vaillant controls, my Y plan before the Vaillant controls were fitted, limited the boiler output temperature was only settable to one HW and CH temperature - though it would service both simultaineously. Once swapped over to Vaillant controls, it had separate temperature setting for each mode, but was then only able to service one demand at a time, prioritising HW.

It did seem to modulate initially, but modulated much more effectively with the Vaillant controls in place.
 
BlueLoo said:
Thanks for the informative answer.
This was mentioned by me yesterday on another thread and got the same silence this thread did .
Clearly, the industry hasn't much interest in it (or likely understanding of it) which isn't a surprise.

Which is surprising to me, I'd have thought it very important.

So is this diverter valve an option or std fit?

If it's an option, it makes an absolute mockery of the condensing boiler laws imho.

I'd be interested in further updates if you have them :)
Click to expand...
This is an interesting read
I think the problem is that most people are looking to pay the least amount of money so installers are ignoring what they consider a minuscule extra saving to ensure they get the job etc. etc.
 
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