For those that think the hr92 is too noisy.

[mtmcgavock]

I've only seen the HR91s mentioned in hushed whispers, like they're a secret They show up on some suppliers but typically as single units, not in multi-packs or kits. I like the idea of them because the LCD screens on the 92s don't really seem to tell you very much... not even the current temperature.

They do tell you the current temperature, you can even change the settings on the HR92 so that the temperature displayed permanently on the screen is either the set point or room temp. I have all mine on room temp, as you know what you've set it at....

[MrBoy]

They do tell you the current temperature, you can even change the settings on the HR92 so that the temperature displayed permanently on the screen is either the set point or room temp. I have all mine on room temp, as you know what you've set it at....

fair enough I guess I should look at the manual properly

[Dan_Robinson]

I've only seen the HR91s mentioned in hushed whispers, like they're a secret They show up on some suppliers but typically as single units, not in multi-packs or kits. I like the idea of them because the LCD screens on the 92s don't really seem to tell you very much... not even the current temperature.

I wouldn't say the 92s I fitted are loud but they're certainly very audible. My valves are all old - I can 'just' push the pins with a thumb if I don't mind it hurting For the valves I have which are not compatible with any adapters, I'm just going to buy a lot of Valencia units - we can do to drain our system anyway so might as well do that at the same time.

Swapped one out today that had been inspected by the owners 2 year old. Thoroughly.

[DBMandrake]

Did 5 on a system this morning in less than half an hour start to finish.

Including draining and refilling ?

On a sealed system maybe. My vented system takes something like 20+ minutes to fully drain and as much again to fill, and there's nothing I can do to speed that up...

[mtmcgavock]

Including draining and refilling ?

On a sealed system maybe. My vented system takes something like 20+ minutes to fully drain and as much again to fill, and there's nothing I can do to speed that up...

Just bung the tank instead then you don't have to drain it, works surprisingly well....

[Dan_Robinson]

Including draining and refilling ?

On a sealed system maybe. My vented system takes something like 20+ minutes to fully drain and as much again to fill, and there's nothing I can do to speed that up...

Why drain the system?

[DBMandrake]

Just bung the tank instead then you don't have to drain it, works surprisingly well....

Can't get enough access to the header tank to do something like that - it's jammed tightly into the apex of the roof in a loft conversion. I can only get at the outside/bottom of the tank without complete disassembly. For the sake of just draining the system I wouldn't trust it anyway, especially in rooms with carpet...

Why drain the system?

Err, How am I going to remove and replace the valve bodies off 8 different radiators with a system with a 5 metre head of water in it ? I'm not interested in any "tricks" like using freeze packs.

[Dan_Robinson]

It's Friday night.. My psychic powers are charged at double time or if hours.

But 5m head is more than many I deal with m

[paulockenden]

I'm not interested in any "tricks" like using freeze packs.

I bought one of these (because I saw it cheap). Haven't used it yet.

[Dan_Robinson]

The issue with those is that, like AC in a car, if you don't use it, they fail. Hence why I got rid of our freezing kit.

We nearly always found quicker and easier ways to do the job. Even if it meant snatching the fitting.

[paulockenden]

This machine is different from the normal freezing kits. It uses the Peltier effect rather than refrigerants. So I don't think it's as sensitive to usage.

[Dan_Robinson]

Fair enough.

[DBMandrake]

I bought one of these (because I saw it cheap). Haven't used it yet.

Will freeze within 30-minutes as long as low temperatures are within the pipes and is not in circulation.

At 30 minutes per pipe it would be quicker for me to just drain down to do 8...

[paulockenden]

It does two at once. But yes, I take your point.

On the other hand, an easy job and a quick job aren’t always the same thing.

[mtmcgavock]

Also it depends how well your open vented system fills back up, we’ve had systems where you spend longer trying to get air locks out than you did actually doing the job.