Viessmann plumbing questions

micks_address

Hi folks,
Some questions re viessmann system boiler. Really more about stats than anything else. Looks like I'm getting one fitted soon and I want to make sure it's setup properly. There will be four pipes at boiler, two to the cylinder and two to the rads. Currently only two pipes to hot press.

I have no working stat at the moment. Heat is either on or off heating both rads and water. Running two new pipes to cylinder for hot water. I'm assuming there's some stats in the viessmann which would measure heat of water in cylinder and come on and off when necessary?

The plumber mentioned today I'd need a motorised valve at the boiler to cut out the hot water?

Then wondering will there a room stat fitted? I don't want any fiddling with analogue stats when I get the nest fitted. I'd like it to control the hot water and the rads.. Two zones which it can do. Confused. Com

Thanks,
Mick

K.Flyer

Was there no explanation regarding cylinder stat and heating stat from the RGI?

micks_address

K.Flyer wrote: »

Was there no explanation regarding cylinder stat and heating stat from the RGI?

Not a huge amount. He is a viessmann certified installer..

K.Flyer

micks_address wrote: »

Not a huge amount. He is a viessmann certified installer..

Don't get me wrong, and we always try to answer questions here, but he should be able to clearly explain what he proposes and how it is all going to work.
There will need to be a stat of some sort on the cylinder and a separate room stat.

micks_address

K.Flyer wrote: »

Don't get me wrong, and we always try to answer questions here, but he should be able to clearly explain what he proposes and how it is all going to work.
There will need to be a stat of some sort on the cylinder and a separate room stat.

Thanks yeah he does seem very experienced.. Just wasn't very clear... Will I need a motorised valve if two different circuits?

You already have a diverter valve in the boiler fitting a secondary valve just to use a app is a bit over cooked

micks_address

gary71 wrote: »

You already have a diverter valve in the boiler fitting a secondary valve just to use a app is a bit over cooked

I don't think I need another valve..

There won’t be a room stat if you’ve asked him to fit a nest if you haven’t asked him to fit it then he has to fit a stat of some sort.

The cylinder has a prob that runs back to the boiler giving hot water priority 24/7 from what I remember so no cylinder stat.

micks_address

micks_address wrote: »

Hi folks,
Some questions re viessmann system boiler. Really more about stats than anything else. Looks like I'm getting one fitted soon and I want to make sure it's setup properly. There will be four pipes at boiler, two to the cylinder and two to the rads. Currently only two pipes to hot press.

I have no working stat at the moment. Heat is either on or off heating both rads and water. Running two new pipes to cylinder for hot water. I'm assuming there's some stats in the viessmann which would measure heat of water in cylinder and come on and off when necessary?

The plumber mentioned today I'd need a motorised valve at the boiler to cut out the hot water?

Then wondering will there a room stat fitted? I don't want any fiddling with analogue stats when I get the nest fitted. I'd like it to control the hot water and the rads.. Two zones which it can do. Confused. Com

Thanks,
Mick

Just going by the above in respect of the hot water valve

K.Flyer

Why don't you look at the dedicated Viessmann heating system app. It might be a more straightforward way to go.

makon_mc

micks_address wrote: »

Hi folks,
Some questions re viessmann system boiler. Really more about stats than anything else. Looks like I'm getting one fitted soon and I want to make sure it's setup properly. There will be four pipes at boiler, two to the cylinder and two to the rads. Currently only two pipes to hot press.

I have no working stat at the moment. Heat is either on or off heating both rads and water. Running two new pipes to cylinder for hot water. I'm assuming there's some stats in the viessmann which would measure heat of water in cylinder and come on and off when necessary?

The plumber mentioned today I'd need a motorised valve at the boiler to cut out the hot water?

Then wondering will there a room stat fitted? I don't want any fiddling with analogue stats when I get the nest fitted. I'd like it to control the hot water and the rads.. Two zones which it can do. Confused. Com

Thanks,
Mick

I have viessmann at home
There Are2 stats in it ( analogue one) another for tap water.( btw one broke and was replaced under 5 y warranty)

Yes u will get motorised valve with the setup.

You can connect nest ( Ive different make) no problem. There is special place in the boiler to connect cables to the radio unit. Once nest is connected it will take control over radiator temp.

micks_address

makon_mc wrote: »

I have viessmann at home
There are 2 stats in it one measuring rads temp another for tap water.( btw one broke and was replaced under 5 y warranty)

Yes u will get motorised valve with the setup.

You can connect nest ( Ive different make) no problem. There is special place in the boiler to connect cables to the radio unit. Once nest is connected it will take control over radiator temp.

Thanks have you four pipes to your boiler?

micks_address

Hi folks,
My viessmann installer seems to have abandoned me which is fine. Phoned few local rgii. Both are recommending ideal vogue 26kw over viessmann because of the ten year warranty on the ideal.

Also said they wouldn't plumb the viessmann in four pipe priority mode as in their experience customers want priority to rads when heat comes on.. I kinda agree with that point actually..

So am I better going ideal vogue with the additional warranty? Or looking for a viessmann fitter who will plumb for priority heat to water?

A fool and their money as they say.. Have to say ten years warranty does sound good. Would still require new piping to cylinder and probably high efficiency cylinder to go with it.

Thanks for being patient with my questions
Mick

micks_address

micks_address wrote: »

Hi folks,
My viessmann installer seems to have abandoned me which is fine. Phoned few local rgii. Both are recommending ideal vogue 26kw over viessmann because of the ten year warranty on the ideal.

Also said they wouldn't plumb the viessmann in four pipe priority mode as in their experience customers want priority to rads when heat comes on.. I kinda agree with that point actually..

So am I better going ideal vogue with the additional warranty? Or looking for a viessmann fitter who will plumb for priority heat to water?

A fool and their money as they say.. Have to say ten years warranty does sound good. Would still require new piping to cylinder and probably high efficiency cylinder to go with it.

Thanks for being patient with my questions
Mick

It makes more sense to heat your hot water at a much higher flow temperature to give a very quick reheat time and then be able to run your radiator circuit at much lower temperatures to save on gas.

Given a choice I’d go with what is most practical and the information you’ve given already makes the VMann the better choice and in my mind without sounding like a brand fanatic a much better boiler.

micks_address

gary71 wrote: »

It makes more sense to heat your hot water at a much higher flow temperature to give a very quick reheat time and then be able to run your radiator circuit at much lower temperatures to save on gas.

Given a choice I’d go with what is most practical and the information you’ve given already makes the VMann the better choice and in my mind without sounding like a brand fanatic a much better boiler.

Thanks Gary,
If I could find someone to fit the viessmann tomorrow i would. I just got a quote of 5.5k to fit ideal vogue and new cylinder extra two pipes etc. Think it's on the high side. Maybe I need a bigger budget.. Was thinking more of around 3.5k straight up price no grant

rightjob!

How many rads and showers in the house?is the cylinder far away from the boiler?

micks_address

rightjob! wrote: »

How many rads and showers in the house?is the cylinder far away from the boiler?

9 rads in total. ive attached a rough sketch of the location of the boiler and cylinder - red lines on drawing indicating new pipes required.. id say you are taking 20 feet from top of boiler if ran under upstairs floor over to hotpress with cylinder.. not mad on lifting floor but think its best job really. One plumber said to me last night that running to the attic would require the system to be pressurized and he wouldn't recommend that.. at this stage I kinda just feel like giving up and living with the system we have for another while

micks_address

I'd love if I could get a quote for and relatively quick install (next two weeks)
New Viessman 26kw system boiler - plumbed in four pipe priority hot water configuration
New rapid heat/recovery hot water cylinder
Two new pipes from boiler location to Hot water cylinder to separate hot water and radiator circuit
A TRV valve fitted on the living room rad downstairs (to shut of rad automatically when stove is heating room)
Whatever system flush is recommended for Gunbarrel, copper, qualplex micro bore
Already have a magnetic filter.
I don't think I need motorized valves... as circuits are plumbed independently.. I might be wrong on this.
I want straightforward integration with the nest thermostat when its fitted - independent control of hot water and radiator circuits..
I have no interest in a grant if I can get all this done for a straight up price of 3 to 3.5k.
You'd think it would be straightforward
Thanks,
Mick

rightjob!

micks_address wrote: »

I'd love if I could get a quote for and relatively quick install (next two weeks)
New Viessman 26kw system boiler - plumbed in four pipe priority hot water configuration
New rapid heat/recovery hot water cylinder
Two new pipes from boiler location to Hot water cylinder to separate hot water and radiator circuit
A TRV valve fitted on the living room rad downstairs (to shut of rad automatically when stove is heating room)
Whatever system flush is recommended for Gunbarrel, copper, qualplex micro bore
Already have a magnetic filter.
I don't think I need motorized valves... as circuits are plumbed independently.. I might be wrong on this.
I want straightforward integration with the nest thermostat when its fitted - independent control of hot water and radiator circuits..
I have no interest in a grant if I can get all this done for a straight up price of 3 to 3.5k.
You'd think it would be straightforward
Thanks,
Mick

I think you are a but optimistic on the price range..

micks_address

rightjob! wrote: »

micks_address wrote: »

I'd love if I could get a quote for and relatively quick install (next two weeks)
New Viessman 26kw system boiler - plumbed in four pipe priority hot water configuration
New rapid heat/recovery hot water cylinder
Two new pipes from boiler location to Hot water cylinder to separate hot water and radiator circuit
A TRV valve fitted on the living room rad downstairs (to shut of rad automatically when stove is heating room)
Whatever system flush is recommended for Gunbarrel, copper, qualplex micro bore
Already have a magnetic filter.
I don't think I need motorized valves... as circuits are plumbed independently.. I might be wrong on this.
I want straightforward integration with the nest thermostat when its fitted - independent control of hot water and radiator circuits..
I have no interest in a grant if I can get all this done for a straight up price of 3 to 3.5k.
You'd think it would be straightforward
Thanks,
Mick

I think you are a but optimistic on the price range..

What are you thinking would be more realistic?

micks_address

micks_address wrote: »

rightjob! wrote: »

micks_address wrote: »

I'd love if I could get a quote for and relatively quick install (next two weeks)
New Viessman 26kw system boiler - plumbed in four pipe priority hot water configuration
New rapid heat/recovery hot water cylinder
Two new pipes from boiler location to Hot water cylinder to separate hot water and radiator circuit
A TRV valve fitted on the living room rad downstairs (to shut of rad automatically when stove is heating room)
Whatever system flush is recommended for Gunbarrel, copper, qualplex micro bore
Already have a magnetic filter.
I don't think I need motorized valves... as circuits are plumbed independently.. I might be wrong on this.
I want straightforward integration with the nest thermostat when its fitted - independent control of hot water and radiator circuits..
I have no interest in a grant if I can get all this done for a straight up price of 3 to 3.5k.
You'd think it would be straightforward
Thanks,
Mick

I think you are a but optimistic on the price range..

What are you thinking would be more realistic?

I don't mind paying more if the job is right.. my concern is I'm getting sort of mixed advice from any plumber I've talked to so far

DGOBS

Ring Precision heat in Dublin, they are Viessmann agents and will point you in the direction of an installer(s) for sure.