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One last thing, where do I put the filling loop and pressure guage in sealed configuration? Do you have a drawing as I am buying things in pieces; have an external EV without a valve and pressure guage.

Same here, that is why I came to this forum for advice. Must have been a typo if I said 120litres anywhere. I can confirm it is 160 litres. Yes, even though it is an open vent boiler but I have checked with Viessmann, it can be put in a sealed configuration. I'll be led by your guidance, in...

Don't know but see attached extracted from a manual for indirect. I have read a term mWC (meters water column). This is similar to mine but a bigger tank volume (500 litres). I am assuming mine with a lower flow rate than 6.5m3/hr would have less mWC (~1m?). Its a heat only boiler with no pump...

Yes, putting the pump on return pipe to boiler. In a system boiler that's where the pump usually is. So it is pumping into the HEX. I could only find the area in sq.m of HEX. Is there a way you could calculate friction loss in HEX if you have surface area

Its 160 litre, single coil type a nd MI with HEX friction loss is also given. I have to connect 3-4 washrooms (3 showers and a kitchen, not baths). so Combi was not an option. 5 adults in house using 3 washrooms. I hav dedicated this boiler to dhw so I don't mind it recovering as we rarely...

Yes, the vitodens has No.5 sensor cables coming out of boiler so its just a matter of putting a thermostat in indirect and connecting the leads to boiler. Correct but it can be used for sealed system as well. Yes, how can I forget it now, we went through 10+pages on this topic when I was...

I stand corrected; 2.4gpm = 9 l/m. Would I be fine using 22mm for primary piping to indirect even though its inlet coil connections are 35mm?

No Sir, I have been away so couldn't respond. To cut the long story. The DHW distribution piping and location of old cylinder were not optimal. I have sorted it out and now have placed the cylinder to a more optimal location of the house where it can supply DHW to all outlets (I think!). I am...

Interesting. You could teach me a few tricks as I am in the process of putting a HW cylinder. When you at 6p.m water was at 55C; after how much time did you get the reading at 6p.m? Depending on your usage, how much are you spending on gas in a day if it is reheated twice; once in the morning...

Hmmm. I have the boiler with CH last year. Bougt WC sensor this year to save on gas and now have to buy Viessmann cylinder box to make HW work. For 100 bucks I can buy a used boiler and dedicate it to HW cylinder separately! From what I have read on forums and documentation. I don't have any...

Ok. Thanks. I have the same timer as pdf in your post.

Yes, already have drayton 2 channel programmer i.e 722. So does mine has both commons connected? I am also thinking of putting a dedicated boiler for HW cylinder? What do you suggest; good idea or waste of resources.

I will share the details of cylinder as it doesn't come with jewllery that goes with installation and I need to buy them separately.

I recall when I was buying the boiler, I was looking at borchures for vitodens 100 and one of them even mentioned (in brochure from Viessmann) that a heat only has pump inside boiler! I sent that exact brochure to their sales team and they came back that brochures have all kind of generic...

Yes Sir, already bought it. And if I put cylinder demand box with it and corresponding wiring, I would be installing it in W plan configuration since the boiler doesn't support OT and hence no X plan, correct? Not sure about it but it doesn't come up with expansion tank or limit stat. Its a 120...

Bought just the WC sensor and wire harness for 35 as I needed it for CH anyway. Cylinder box compatible with my boiler is 7296 968 I didn't buy the box as I wasn't sure what it does. Now that I know, I will look at options to buy it. Thanks for advice on ebay purchases. Do I require HT...

Exactly. I have read that Intergas and other boilers work out of the box without any add-ons or trickery. A couple of leads are tucked from X20 in my boiler (I have not connected HW to the boiler yet) which I think goes into cylinder demand box. The box cost around 110 from viessmann direct and...

I recall sending an email to Tech support when I bought the boiler and this is what they had to say (see attached)

On wiring harness from X21; port 3 and 4 are marked as WC. Port 1 and 2 doesn't say anything for OT which made me think that it is not compliant but on the manual it does.