New combi install, help needed

[muggles]

Sounds like a typical install by Messrs Bodgit & Scarper, only a day allowed to do the job and boiler launched on to the wall in the shortest possible time with the least possible care. Hopefully they were cheap.

As to your other issues, what flow rate do you get from other outlets? Are they all similarly affected? What about the cold? What does the pressure gauge on your pressure reducing valve read when you have the bathroom tap running?

And no, it's not reasonable to expect someone to just do potentially an extra hour's work on something you haven't previously notified them about. It's highly unlikely that would have been completed in 10 minutes. If you knew it needed doing, you should have mentioned it when you booked them in to do the job

 

[DP]

That gas pipe through the wall, is it protected

 

[LeeroyK]

Sounds like a typical install by Messrs Bodgit & Scarper, only a day allowed to do the job and boiler launched on to the wall in the shortest possible time with the least possible care. Hopefully they were cheap.

As to your other issues, what flow rate do you get from other outlets? Are they all similarly affected? What about the cold? What does the pressure gauge on your pressure reducing valve read when you have the bathroom tap running?

And no, it's not reasonable to expect someone to just do potentially an extra hour's work on something you haven't previously notified them about. It's highly unlikely that would have been completed in 10 minutes. If you knew it needed doing, you should have mentioned it when you booked them in to do the job

He wasn't cheap actually, took him two days though. A lot of that was spent looking inside the wall for the 22mm gas feed, which he eventually found.

The irony was the viessmann inlet is 15mm.

He made a good job on the old flu hole, not happy with the pipework inside. It was one of those online places that do it for a fixed price.

HW pressure is the same from all outlets, cold flow is great all around, 17L/m, bit less upstairs.

That's obviously my ignorance then, to my layman's mind it's simply drilling two holes and hand sawing a hole, resoldering a couple of joints. Everything else he was doing anyway. I thought plumbers may use a little hand angle grinder with the depth set to plasterboard thickness.

My bad I guess, I'm now seeing/thinking this is something people must do quite often and is a bit of a cliche. Not harm meant on my end, I genuinely thought it would be a simple request that would be happily fulfilled being as I'm paying for 2 days work.

So back to the job/work...

I'd really like full bore copper from the CW feed to the boiler, seems crazy to reduce things down there when it affects the whole HW system. As mentioned that plastic pipe is probably 11mm internal and that plastic elbow could be as little as 8mm (5mm?).

Not sure how best to approach things...

 

[LeeroyK]

That gas pipe through the wall, is it protected

Not sure what the difference would be, I'll attach a photo of how he left it....

 

[oldbutnotdead]

That pressure gauge bottom left of the boiler - if that's a reducing valve then no wonder your hot flow is rubbish, it's only at 1.some bar (assuming that's the cold inlet).
EDIT Sorry, looked again- it's a rough arse pressure gauge on the heating side, my bad
EDIT 2 A foot of placcie and some inserts won't be dropping the pressure by 50%. Is there any other valve gear between cold supply and cold inlet to the boiler?

 

[LeeroyK]

That pressure gauge bottom left of the boiler - if that's a reducing valve then no wonder your hot flow is rubbish, it's only at 1.some bar (assuming that's the cold inlet).
EDIT Sorry, looked again- it's a rough arse pressure gauge on the heating side, my bad
EDIT 2 A foot of placcie and some inserts won't be dropping the pressure by 50%. Is there any other valve gear between cold supply and cold inlet to the boiler?

If there is it's behind the washer and drier and I can't get behind there.

Gotta wait till Thursday to find out, that's when he's back...

 

[picasso]

Probably starved of gas if this elbow is any thing to go by.....

 

[LeeroyK]

Probably starved of gas if this elbow is any thing to go by.....View attachment 242764

Yeah, I don't know what's going on with those elbows, not seen them before. The ones I've seen are 15mm around the bend, these look stretched out or something...

It looks like it goes down to 10/12mm or something as well. (edit: actually that's probably 22mm coming out the wall, still, the bend is not good)

 

[Crezzer]

Why didn't you use a local tradesman?

 

[fixitflav]

HW pressure is the same from all outlets, cold flow is great all around, 17L/m, bit less upstairs.

That could suggest a restriction in the gas supply, so it throttles the water flow to achieve the required temperature. There must be boiler inlet and burner pressure tapping points, a check with a simple water-tube manometer would tell whether it meets the boiler spec.
What length is the 22mm gas pipe? That 15mm elbow doesn't look ideal, but I estimate it gives pressure drop no more than about 0.25mb.

 

[LeeroyK]

That could suggest a restriction in the gas supply, so it throttles the water flow to achieve the required temperature. There must be boiler inlet and burner pressure tapping points, a check with a simple water-tube manometer would tell whether it meets the boiler spec.
What length is the 22mm gas pipe? That 15mm elbow doesn't look ideal, but I estimate it gives pressure drop no more than about 0.25mb.

What length is the pipe in total? From the meter? It's gotta be 10 m, maybe a little more.

 

[LeeroyK]

Why didn't you use a local tradesman?

The local people I contacted either didn't have the availability, wanted too much money or wanted to use their preferred boiler when I was set on the viessmann so I used a company that would supply and fit that.

 

[Crezzer]

So you went with the cheapest quote?

 

[fixitflav]

What length is the pipe in total? From the meter? It's gotta be 10 m, maybe a little more.

OK, at that rate, including some fittings I make pressure drop less than 1mb.

 

[LeeroyK]

OK, at that rate, including some fittings I make pressure drop less than 1mb.

And it would ordinarily be above 19 right?

Also look at that elbow though, that's 15mm pipe reduced down to what, 10 in that elbow?