Navien Combi Boilers

[Dan Robinson]

Enjoy

 

[fixitflav]

I see Maintap is avoiding direct questions again.

Fixit, what boiler mod are you talking about?

Not with you there. I don't think I've mentioned boiler mods.

Ref zero ratio gas valved boiler, I googled it and found an earlier DIYnot thread (though it wasn't called that exactly). According to that, the vacuum for a negative pressure valve is not produced by the fan directly, but the fan is in positive-pressure mode and uses a venturi to produce negative pressure. Not that it makes much difference to the fan, for the sort of differential pressures involved. I don't think it affects anything I said. I was only querying mwgs's assertion that there's no difference between the two types.

Read more: https://www.diynot.com/diy/threads/navien-combi-boilers.507427/page-9#ixzz5PE9mm0RZ

 

[hard-work]

I've been watching this for a while and see a few of the more respected chaps are on here,but I'd like to know were hard work s going with this.Are you a sales rep or something or have you technical knowledge in the gas field or are you just having a pop at the forum or just a pop at the good people on this forum because you've dropped a few clangers in your posts which makes you seem a bit silly and hard to follow at times.

I have dropped no clanger. Read the thread from the beginning. I know some dross creeped in.

 

[hard-work]

Dannyboy, you have not said "muppet" for a while yet. Slacking man. Slacking.

 

[hard-work]

I was only querying mwgs's assertion that there's no difference between the two types.

He was told by me here there was a difference between the valves, but he developed an attitude - as many of the uneducated here do.

 

[Deleted member 221031]

Amazing this one thinks he can lecture me on gas controls.

It’s not a lecture. I’m just pointing you in the direction you need to go.

As Dan has said, you clearly avoid answering the difficult questions

Why ? Well we all know why. It’s simple really.

 

[Deleted member 221031]

He was told by me here there was a difference between the valves, but he developed an attitude - as many of the uneducated here do.

He was told by me here there was a difference between the valves, but he developed an attitude - as many of the uneducated here do.

There’s no difference unless you can explain it ?

You can’t. It’s not hard really. Please try

 

[hard-work]

According to that, the vacuum for a negative pressure valve is not produced by the fan directly, but the fan is in positive-pressure mode and uses a venturi to produce negative pressure.

Just think of 48 foot of 1" hose pipe. The water flows out in volume but not great velocity. Remove 24 foot of the 1" hose and replace with 24 foot of 1/2" hose pipe. The water will come out faster and go further. The water velocity in the 1" pipe will not change much, but the water in the 1/2" will be faster. Nothing is being sucked. Equate that to a gas pipe with a negative pressure valve.

Navien use the negative pressure valve that appears an option on the 200,000 BTU/hr (57kW) model. That makes sense to keep gas pipe sizes down. The UK models are nowhere near that big - yet. At 57kW this combi must bang out the DHW flowrate.

 

[hard-work]

There’s no difference unless you can explain it ?

You can’t. It’s not hard really. Please try

I tried with you but failed. I now give up. Even fixitflav tried.

 

[Deleted member 221031]

It’s

He was told by me here there was a difference between the valves, but he developed an attitude - as many of the uneducated here do.

There is no difference. You don’t have the knowledge to prove other wise.

 

[Deleted member 221031]

I tried with you but failed. I now give up.

Quality

 

[hard-work]

It’s
There is no difference. You don’t have the knowledge to prove other wise.

You are not an idiot, but moving that way. Sort yourself out.

 

[Deleted member 221031]

I tried with you but failed. I now give up.

Failed, because you are just making it up on the fly.

I’d take you seriously if you’d answer any question.

But you don’t.

 

[Deleted member 221031]

You are not an idiot, but moving that way. Sort yourself out.

Good answer. Shows your technical understanding. I’ll bow out now.

 

[Dan Robinson]

Still unable to answer questions. Still deflecting the attention.

Still utterly clueless.


Fix it, that should have read "What model boiler?".