New boiler day

[paulockenden]

No, it's a side-mounted immersion, near the bottom. Although the tank is quite short being only 120L - I don't think stratification will be as much of a problem as it would with a tall cylinder. It's 90cm tall by 55cm wide. Dumpy little thing.

[DBMandrake]

My tank is only 90 litres and stratification is definitely still a thing. The immersion element is mounted from the top and only heats about the top third of the cylinder, the rest stays cold!

[paulockenden]

If it becomes an issue I'll put a de-strat pump in. Would need to be bronze because this is potable water.

But I don't think it'll be a problem - the immersion is just above the coil.

[paulockenden]

BTW, plumbers couldn't believe the existing setup here. 1950s house. Inch and a quarter hot and cold pipes from the tanks in the loft, two inch overflow. They said it's the kind of setup you'd expect to see in a school, not a domestic property (it's not an especially big house). We now know why it took so long to get hot water to the kitchen tap!

I said they could have the scrap, which helped!

P.

[bruce_miranda]

I once had a plumber who suggested that all main pipework be 28mm and all radiator circuits 22mm with the 15mm just to the radiator. Sounds like a certain plumber school.

[G4RHL]

Nope. Combi. But with (when the sun's shining) hot water being fed to the boiler on the DHW side, so the boiler doesn't have to add much/any heat.

Not all boilers allow this, but Intergas is fine with up to 60 degrees.

Sounds like a nice approach. Not sure I would copy it though as my DHW is only on for 1.5 hours per day and a bigger aspect - I don’t have any solar panels! Like getting a new boiler in my case, the savings don’t match the installation cost for many years and when they do it seems in many cases it is time to replace again. You never save - although Intergas I suspect will have a much better life expectancy than the stuff BG and many others want to supply you with.

[paulockenden]

Damn, looks like the extremely talented bunch of cowboys that initially installed my system a couple of years ago didn’t leave the other sensor for the hot water kit - I’ve only got the strap-on, which won’t work with the new tank. Grrrr.....

[darrendobson]

I was told that new regulations demand a 22mm gas pipe to the boiler. My meter is on the outside of the house but luckily it is near the boiler. Unfortunately, my electric meter is on the opposite side of the house so it was not possible to 'earth' the gas pipe which caused an issue when I had to update the earthing cable around the fuse box as I refused to have a cable around 3/4 of the outside of my house or have the whole ground floor up! It ended up as a recommendation in the certificate only.

Note: dty I can't send you a private msg as you private msg box is full it seems.

Chris did they really only flush for 30 mins? That is not sufficient. your system looked in bad condition judging by that magnacleanse

22mm pipe is not a regulation across the entire boiler industry

Worcester instructions require you to have 22mm for a 24 ri but you always calculate pipe size depending on what boiler you have

[bruce_miranda]

The size of the gas main is largely dependant on the distance from the meter and the size of the boiler during operation. I needed a 28mm pipe which was reduced to 22mm and then finally 15mm to enter the boiler. But that was to satisfy the full 38Kw load. I run my boiler at 18Kw, which doesn't need the 28mm, but it's installed, should it be needed. And it's not just diameter and length of pipe that matters, every angle and bend also needs to be taken into the calculation.

[chrisgare]

Chris did they really only flush for 30 mins? That is not sufficient. your system looked in bad condition judging by that magnacleanse

22mm pipe is not a regulation across the entire boiler industry

Worcester instructions require you to have 22mm for a 24 ri but you always calculate pipe size depending on what boiler you have

The next week, I took every radiator off the wall individually; took them outside, turned them upside down and flushed them out with a high pressure water hose. My garden turned black but boy did my radiators get hot afterwards! Highly recommended.