Flow- Vent- Feed -Pump

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Just another thought on this - we've been trying to get an OV system in a 2.1m high space, and it doesn't work at all satisfactorily. I usually prefer OV over pressurised, but in this instance the latter could make a lot of sense. Might even be able to fit the boiler at a convenient height!
That's a good idea but I was avoiding pressurised system due to potential leaks in existing pipework. Boiler being an OV boiler can also work in pressurised system.
 
The boiler can really be fitted anywhere in the chain, if it's a HO but there are more favourable positions for it, depending on the system layout
If boiler can be placed anywhere in the system; what are the locations where it cannot be placed? Just a thought, I know you said it depends on pipework but considering its a two storey house; the farthest lenght is 100ft from boiler (flow only).
 
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If boiler can be placed anywhere in the system; what are the locations where it cannot be placed
Well ... you kinda answered your own question - there isn't really anywhere it cant be placed as long as the system is setup correctly, proper pump settings etc. The biggest issue over distance is heat loss, so everything should be lagged.

As far as leaks on the system are concerned, you can pressurise and test over a day or 2 before anything is done to see if there are any weak points, add a gauge for finer monitoring.

Boiler is stated as an OV as the presumption is that model is designed for OV systems, though most HO boilers can be used for either and it does also mention pressure settings when filling as sealed (unvented) but another confirmation from Viessman couldn't hurt.
 
If boiler can be placed anywhere in the system; what are the locations where it cannot be placed? Just a thought, I know you said it depends on pipework but considering its a two storey house; the farthest lenght is 100ft from boiler (flow only).
I thought you were pretty much set on the boiler location. If you can put it elsewhere the height problem might go away. On the subject of pressurised, if all or most of the pipes are exposed (vs buried or in voids etc) leakage is less of a worry, at least it's visible and relatively simple to fix.
Like most things in life, there may not be an ideal answer, compromise needed!
 
Boiler is stated as an OV as the presumption is that model is designed for OV systems
I have sent them an email for confirmation already. It doesn't have pressure guage, not sure about PRV inside the boiler.
 
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I thought you were pretty much set on the boiler location. If you can put it elsewhere the height problem might go away.
This location ticked all the right boxes apart from height which I didn't know about earlier. This suits me to add DHW to this locaion as well in future. I read somewhere earlier that OV boilers can be used in sealed systems that's why I went with this boiler. I weighed my options earlier and decided that OV is good for simplicity and maintenance, now with this road block (of height constraint) at the location I am at a decision point again! Looking and open for suggestions, part of me is inclined to go with OV but may be this is due to the fact I have never used a pressurised system before.
 
This location ticked all the right boxes apart from height which I didn't know about earlier. This suits me to add DHW to this locaion as well in future. I read somewhere earlier that OV boilers can be used in sealed systems that's why I went with this boiler. I weighed my options earlier and decided that OV is good for simplicity and maintenance, now with this road block (of height constraint) at the location I am at a decision point again! Looking and open for suggestions, part of me is inclined to go with OV but may be this is due to the fact I have never used a pressurised system before.
If it doesn't have pressure gauge and PRV built-in, it's easy enough to fit them externally on the pipework
 
Yes, there was a prv on on my existing boiler as well, and an EV, that's it?
 
What I meant to say that my existing setup has a PRV but no EV. I need to add EV to set it as pressurised system.
 
Yes, there was a prv on on my existing boiler as well, and an EV, that's it?
If you mean a PRV as in pressure relief valve then there must be a pressure gauge somewhere as well, either on the boiler or after the filling valve
I have a pressure relief valve on my boiler but no EV, as mine is a OV system.
 
When you source an EV for the system, if sealed is the way you're going, then just get a sealed system kit. It'll come with the EV, 3 bar PRV, gauge, filling loop and a 4 way coupler to connect it all up. You just need to size the vessel accordingly.

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