is theres a way of actually having a cylinder inline with the comb DHW

[steveignite]

Hi,
A customer has asked if theres a way of actually having a cylinder inline with the combi dhw outlet, and not a case of e.g kitchen fed tap of combi. then rest of the house unvented cylinder. Reason for this is the Building is 127 feet long with 4 bathrooms. all at the rear. with an existing 38kw combi. only 2 people live there. They have already Brought a 300 Litre unvented with solar. Please Help

 

[Billy Bob Bob]

yes its called a motorised valve,as long as you take 1 tap off the combi

 

[steveignite]

Hi Gas Man,
Thank you for your prompt reply.
what you have suggested, what i would normally do, however i've been asked if its possible to basically tee the unvented cylinder to the existing pipework connected to the Combi DHW.

 

[Dotty]

Linking the two DHW secondary circuits together you mean?

 

[Billy Bob Bob]

Hi Gas Man,
Thank you for your prompt reply.
what you have suggested, what i would normally do, however i've been asked if its possible to basically tee the unvented cylinder to the existing pipework connected to the Combi DHW.

no its not

 

[Dotty]

There was a moment of

 

[steveignite]

Thats exactly what i thought.

 

[bigads28]

No that won't work, supplys won't be balanced. The combi was never gonna feed all that anyway.

Just tell the customer it won't deliver on performance and this is the way its gotta be! If the cylinder has to be beside the boiler then put in a bronze pump on a 2nd return.

 

[steveignite]

Hi, thanks for the reply,
The costumer does use the front of the house (Kitchen) and 1 of the showers at the rear.
However would like to use the other bathrooms when family are over. Over 100 feet away.

 

[Ermintrude]

Yes you can. Either in series or in parallel with a tcv (thermostatic change over valve)

 

[kris]

The only way you can use the hot water tank aswell as combi is by linking the coil to heating circuit using a motorised valve and its own controls. and as long as tank Is fitted by g3 engineer and hot water circuits are totally separate . Part of the buildings hot water can be fed from tank and other half from boiler.
It's quite scary your asking if hot waters can be linked if your a plumber.

 

[steveignite]

Thats what i proposed Separate Systems. But the customer keeps asking, So i thought just to make sure ask.

 

[Ermintrude]

A combi would never hear the flow from cylinder but boiler can be used as back up.

 

[steveignite]

Whats the "Like" all about?.
New to This.

 

[Dotty]

Just a way of showing support by liking a particular post, in the way I've just liked a couple of yours.

 

[Dotty]

We did have a 'don't like' button but I wore it out in a couple of days.........

 

[rpm]

We did have a 'don't like' button but I wore it out in a couple of days.........

So your the one!
I could do with you replacing it sometimes lol

 

[PlumbBobBob]

yes he got quite a wrist slapping over that

 

[rpm]

Was it a Blue on Blue moment?

 

[Worcester]

Have they also invested in the solar thermal?

If so consider something like the Grant combisol Solar Water Heating. Combine Your Existing Heating With A Grant Solar Heating Solution | Grant UK

p.s. you need to be seperately certified to install solar if they want to get paid for it.

Plumbing it will be fun with that long run though...... as the combisol works the other way round from what you're thinking...