Baxi Main Medway Super water heater Question.

[acecharly]

A mate of mine in a pizza shop has one of these in the shop just for heating water and the pilot keeps goin out. It looks like its had its day and needs replacing to be fair. I don't know if im missing something here but the shop has a commercial meter so it should have standing pressure of 38mb but when I looked in the MI I read this. ---- The nominal burner pressure should be 12.5 mbar and will only be obtained if the appliance inlet pressure is correct at 20 mbar even when the appliance is running at full heat input. The meter should be capable of passing 100ft3/h of natural gas plus the requirements of any other gas appliances.---- So im thinking should he replace it with one of these? Does the boiler regulate the gas pressure down to 20mb working pressure no matter what the standing pressure is?

 

[Killy Bing]

....im going to remain quiet but pretty sure croppie will appear!!

 

[Mike Jackson]

Step away from the gas appliance.

 

[acecharly]

Its just not something you would ever question if you only work on domestic as you would expect 20mb working pressure at the appliance. Oh but hold on ....oh think I may have made a tit of meself here something just clicked lol

 

[Dotty]

Was that the sound of the lpg penny dropping?

You got cocn1, lpg and comcat?

 

[acecharly]

No its ng but commercial so its not anything I could do anyway, it was just to advise on a replacement as he asked me what I thought

 

[acecharly]

Oh and the penny dropping was that standing pressure can be higher a lot of the time and the boiler still works fine at 20mb working pressure. I had 28mb once and called out the transporter who said they weren't to bothered about it being high it was just obviously if it went lower than 21mb where its serious.

 

[Killy Bing]

Rinnai are impressive for water heaters but im sure you would want something more beefy.

I thought potterton made the Medway supers?

don't these things give gout 45ltr a min at 40 degree rise?

 

[Dotty]

What meter is it?

 

[acecharly]

I don't know I didn't take that much notice I know it was bigger than a u16, the anaconda was as thick as my arm and it ran of in 2" screwed so it defo wasn't a job I could do as it was obviously commercial. I wouldn't even entertain the idea of installing it. My main point to the guy was that it was old had a poor flame picture, pipework looked rotten and needed changing.