Megaflow - Why so expensive to install.

[ChrisR]

Tony will underquote anyone, as long as they're outside his area!

Er, problem:
If your mains is that high pressure you really need to take the shower cold supply from the outlet side of the pressure reducing valve on the unvented inlet, so H and C pressures are the same.
This probably means a new pipe into the house from the garage, probably a nightmare. A reasonable workaround would be a pressure reducing valve at the shower, or a pressure equallising valve if you get a good one. Cheapies restrict the flow rather a lot.

Where's the discharge pipe going to go, by the way?

 

[Balenza]

Agile wrote

Its essential to assess it before fitting an unvented!

Dynamic pressure under flow conditions you mean. ?
Irrelevant in my view. If you have a good static pressure and volumes of lpm at the incoming mains to the property then you won't go far wrong.

 

[gas4you]

I would have thought about £600 + vat if easy installation going up to 900 possibly if awkward, plus materials. Tony always quotes prices that are less than anyone else as ChrisR says.

 

[Dan Robinson]

Now the poor sods who actually seen the job are going to get their balls broken 'cos everyone seems bent on quoting their pirces.

While I agree *£1600 is a little high, there are so many variables that I don't think it is fair to be giving these low figures.

Alter and adapt all pipework to suit, run new as required.

Thats the unknown bit isn't it...?



*Sorry typo - I put £2600 instead .

 

[gas4you]

I cant see how any unvented installation only could take more than 3 days

 

[chrishutt]

Dynamic pressure under flow conditions you mean. ?
Irrelevant in my view. If you have a good static pressure and volumes of lpm at the incoming mains to the property then you won't go far wrong.

Oh dear, someone else who doesn't understand the significance of dynamic pressure. I've just been looking at a house where the static pressure is good at 5 bar but with 20 litres/min flowing the dynamic pressure drops below 1 bar! That's a clear indication of a restrictive supply pipe which will not support an unvented cylinder installation.

 

[Balenza]

Dynamic pressure under flow conditions you mean. ?
Irrelevant in my view. If you have a good static pressure and volumes of lpm at the incoming mains to the property then you won't go far wrong.

Oh dear, someone else who doesn't understand the significance of dynamic pressure. I've just been looking at a house where the static pressure is good at 5 bar but with 20 litres/min flowing the dynamic pressure drops below 1 bar! That's a clear indication of a restrictive supply pipe which will not support an unvented cylinder installation.

Tripe. If the flowrate's delivering 20L/min its more than sufficient for a UV installation.



Ok , so mebbe its not the best flowrate in the world. But the fact remains that if you have the pressure/flowrate to begin with then dynamic pressure is irrelevant.

 

[Dan Robinson]

Sufficient yes - more than sufficient? You obvisouly have customers with low expectations!

 

[Balenza]

Dan Robinson wrote

You obvisouly have customers with low expectations!

Most of then have systems similar to the OP's. ie 6-8 bar.
Im installing a UV shortly in a large 5 bedroom property with 4 mira excel biv,s and neither static, dynamic or any kind of flowrate is measured yet.
And before you ask, no im not certified to fit UV cylinders.

 

[Dan Robinson]

Sorry B but that does not impress. And I hope BC will be inspecting.

 

[Balenza]

Bombs away.
http://www.waterheaterblast.com/
Head down , incoming.

 

[Balenza]

Chrishutt wrote

dynamic pressure drops below 1 bar!

Where did you measure the dynamic pressure and what distance roughly from this point to the outlet in question ?.
I shall assume 15mm convoluted pipework as your flow restriction.

 

[chrishutt]

Where did you measure the dynamic pressure and what distance roughly from this point to the outlet in question ?.

You first said it didn't matter, now you seem to think it does. Well the pressure test point was 8 metres upstream of the outlets as it happened. Now let's see you draw false conclusions from that.

 

[Dan Robinson]

Here we go...

 

[Balenza]

Chrishutt wrote

now you seem to think it does

Nope.