Conventional boiler.... comeback Combi all is forgiven!

[Dan Robinson]

Sorry my hob is 11kW I was looking at the poverty spec version before

 

[Corgigrouch]

As with combis, thermal stores have their place, they are great for linking in solid fuel boilers....

 

[Dan Robinson]

Is bell end trying to get out of his gross over sizing idea by suggesting some form of thermal store/buffer? Or am I imagining it and being charitable?


Hardly a way to simplify the install is it?


I notice he hasn't worked the figures from my post yesterday

 

[Corgigrouch]

Last time he was about, he was pushing the virtues of Thermal stores for every application..... His line of thought is about as logical as an explosion in a Spaghetti factory..

 

[Dan Robinson]

I suppose we could wire an interlock through the Atag's safety terminals on the pcb.

Then when missus wants to cook or use the gas fir, she can flick a switch to keep the boiler off?

 

[Corgigrouch]

I want to see the look on the customers face when you tell them the size (and cost) of the gas pipe from one side of the house to the other.....

 

[Dan Robinson]

Last time he was about, he was pushing the virtues of Thermal stores for every application..... His line of thought is about as logical as an explosion in a Spaghetti factory..

I remember.... he almost single handedly ruined TSs' for everyone.

Incidentally I have mine running at 55 degrees with a boiler flow of 65.

I think I'll be emptying the condensate bucket more often now

 

[Dan Robinson]

Google must be down again

 

[picasso]

More likely the nurse has been round with his medication.

 

[matt1e]

The boiler modulates down to approx. 8 kilowatt. Then weather compensation reduces cycling - it comes with the boiler, outside senor is extra.

You really do struggle with the basics don't you.

I know googleering is your specialty, but this kind of stuff takes a litle more skill than that.

The modulation range of the boiler IS 9.8 - 48.7kW at 50/30. 8.8 to 44.7 at 80/60. So the lowest it will go with WC is still nearly 10kW.

Now we have already establiched a 4 bed house is only going to need that for a few weeks a year, so the rest of the time the boiler is going on an off.

Even yes EVEN with weather compensation fitted.

Totally pointless and totally ridiculous to be suggesting.

Now about this 9./8kW minimum output.... how does WC enable the burner to go lower than this?[/u]

Well I haven't read completely through all 10 pages, but Dans post above just about sums it up

Tellmewhy, he has just told you why in simple enough terms and there is nothing Dan has written above that is disputable
why can't you see this?

Matt

 

[Tom1981]

I never seen a Atag boiler

The largest "Combi" I've come across are boilermates, in the various styles. As we know its a Thermal Store with a plate or coil with a boiler chugging away on full chat to keep that store around 60C. Basic what a Combi does, correct? Could argue a Powermax, Idea's isar bodge up, etc too.

A good bonus is you have almost instant heat into your rads.

 

[SimonH2]

Try having a body jet shower and see how big the cylinder will have to be. ...

... A well designed thermal store will do a body jet shower and never run out of hot water reverting to what the boiler can deliver when the cylinder runs out of heat. The cylinder does not to be as big and any unvented cylinder.

But an unvented (or open vented) cylinder will also have heat added by the boiler while hot water is being drawn off. How useful that is depends on the design and capacity of the reheat coil. but it's certainly not a case of "have 100l cylinder, draw off 100l of hot water, cylinder not has 100l of cold water".

In extreme, if you draw off continuously, then the cylinder becomes a combi with voluminous heat exchanger - as per Tom1981's suggestion below. You can draw off water continuously, and once the stored heat is used, just as with a combi the temperature is determined by the flow rate and the heat input. I suspect that a decent cylinder, with a high capacity coil, could keep a shower going indefinitely - unless it's a wasteful water guzzling shower.

The largest "Combi" I've come across are boilermates, in the various styles. As we know its a Thermal Store with a plate or coil with a boiler chugging away on full chat to keep that store around 60C. Basic what a Combi does, correct? Could argue a Powermax, Idea's isar bodge up, etc too.

Well that's something of a stretch !
I suppose you could argue that a very small thermal store does have characteristics in common with a combi in that the boiler is constantly adding heat to replace what's been taken out by the DHW drawoff. But even a modest sized thermal store has what the name implies - thermal storage - which means you aren't reliant on the boiler output for all the demand. But if the boiler output is (say) half the power drawn off in hot water, then it'll double the effective size of the cylinder since half the energy removed is being replaced in real time by the boiler.

A good bonus is you have almost instant heat into your rads.

Not sure that's a particularly compelling selling point. For something where normal usage is for it to be on for hours at a time, a minute or two starting up isn't really a big deal (for most installations).

 

[Happyplumber]

Welcome back Drivel ,I see you are now recommending a different brand of boiler

The last Boiler you championed so much here and on every other web site ,what happened to that,seems like you have changed your mind

The Remeha Avanta

 

[Dan Robinson]

Think he's off frantically looking up the this interlocking function

 

[TellMeWhy]

Welcome back Drivel ,I see you are now recommending a different brand of boiler

The last Boiler you championed so much here and on every other web site ,what happened to that,seems like you have changed your mind

The Remeha Avanta

What the hell is this one on about?