Large house combi v system boiler?

I don't install boilers or heat banks or unvented. I
install whole bathrooms

A bathrooom changer!!!! :) But he know all the answers about pressures and thermal systems. Wow!!! What a belly laugh! Keep 'em comin'!
 
I don't install boilers or heat banks or unvented.
I
install whole bathrooms

A bathrooom changer!!!! :) Good at tiling are
you? :) But he know all the answers about pressures
and thermal systems. Wow!!! What a belly laugh! Keep
'em comin'!

That's the best you can do is it?
 
Well, as said 'Naesure' with combi's there are pros &
cons.
Combi's are sized on there HW output & most of the
larger condensing combi's require high gas pressure &
flow rate at the appliance, which may result in a
meter change & up too 35MM as service
pipe...etc..etc.

I know no domestic combi that requires a U16 meter. Only if you keep gas fires and other unnecessary stuff will that result.

But really for a larger domestic installation like
yours, storing hot water is the optimum system and
with the incoming mains pressure/flow permitting, an
unvented cylinder will give your good pressure &
simaltainious use of appliances.

But expensive!! And big!!!! And large combis store water to!! Try looking at a high flow Rinnai multi-point that can be fitted outside.
 
I don't install boilers
or heat banks or unvented.
I install whole bathrooms

A bathrooom changer!!!! :)
Good at tiling are you? :) But
he know all the answers about
pressures and thermal systems.
Wow!!! What a belly laugh!
Keep 'em comin'!

That's the best you can do is it?

What a let down. We were expecting more fun from you.
 
Walter, how do you manage to keep spouting drivel all day and all night?

Do you actually have a job?

Do you know anything at all?

Or are you just a sad old troll?
 
What a let down. We were expecting more fun from you.

That's just what we were expecting from you.

It obviously would be too much expecting you to actually show that you understood anything about all the things you cut and paste.

It still puzzles me that someone who says he is a graduate is lacking in even the most basic ability to analyse systems. Not to mention your inept maths and your complete inability to read.

No, you just keep prattling on and give us all a good laugh.
 
That's it WS, go and plumb in the garden too!

It might interest you to know that the return temp of a heat store is far too hot for the boiler to condense efficiently - between 35c and 60c is very efficient.

You might RECOVER MORE energy than at 60c, but that's because you're also WASTING MORE energy to start.

Anyone with a brain could figure out that the hotter the return temp and the gas going through the flue the more energy is being wasted. Which is why I have explained it for you.
 
What a let down. We were expecting more fun from
you.

That's just what we were expecting from you.

Yo disappoint!
 
Walter, how do you manage to keep spouting drivel all
day and all night?

Do you actually have a job?

Yes, but I don't tile bathrooms.
 
Walter, how do you manage to keep spouting drivel all
day and all night?

Do you actually have a job?


Yes, but I don't tile bathrooms.


No

That would require hard work, skill and application... tiles don't stick themselves to the wall by yakking rubbish at them
 
The only thing around here that is dangerous when unvented is dear old Walter.

Imagine if all that hot air was left shut in....KABOOM..it would make a great clip on Youtube.
 
That's it WS, go and plumb in the garden too!

It might interest you to know that the return temp of
a heat store is far too hot for the boiler to
condense efficiently - between 35c and 60c is very
efficient.

Totally WONG!!!!

MAINLY CONDENSING OPERATION

If a whole bath is run off and the store temperature is around 10C, the boiler will raise that water say 35C to 40C emerging from the flow pipe - the temperature rise of the boiler. 10C returning to the boiler will guarantee high condensing operation. <u>Even if the condensing boiler is set to 80C, 80% of reheat time will be in condensing mode</u> and even more if set to 70C to 75C. The initial 1/3 of re-heat is highly efficient.

At return water temperature of 30C, 70% to 80% of latent heat is recovered. At 35C only 50% is recovered. A big difference in efficiency for only 5C return water difference. The thermal layering of a thermal store and the plate Heat X pumping water into the bottom of the cylinder less than 30C, ensures that when in operation the boiler is highly efficient recovering more latent heat than a condensing boiler directly coupled to a rad circuit and a coiled cylinder.

LARGE BOILERS CAN BE USED WITHOUT ADVERSE EFFECTS
A 70kW condensing boiler can be coupled to a direct store using 28mm pipes. This will give a high temp rise and ultra quick recovery.

DHW ENSURES VERY COLD CYLINDER BOTTOM
The modulating DHW pump ensures only very cold water returns to the cylinder. This gives a very cold spot at the bottom of the cylinder. This cold water then is pumped directly into the boilers return when the boiler is called.

SCALE RESISTANCE
The plates on the plate heat X flex and scale build up reduced. Scale is only a real big problem in excessive hard water areas like Reading.

THERMAL LAYERING DOES IT
Thermal store heat banks (with plates heat Xs) set to 70C give very acceptable DHW performance and condense <u>very well</u>. Thermal layering does it all for you. <u>Get to understand thermal layering</u>. The top of a cylinder can be 80C and the bottom 20C. The boiler is in the most ideal hydraulic environment enhancing efficiency, giving high condensing efficiency and boiler longevity, always having full flow through the boiler

BOILER CYCLING ELIMINATED
Heat banks eliminate boiler cycling which can be very inefficient in thermal heat loss and burner start up. The vastly reduced stress on controls gives boilers a long life. Very neat indeed. If a preheated combustion air boiler is used, tertiary heat exchanger, cycling can reduce the high efficiency of these boilers. Continuous operation for as long as possible improves boiler efficiency and thermal stores do that.

Now you know. You can now tell your mates in the pub.
 
Walter, how do you manage to keep spouting drivel
all
day and all night?

Do you actually have a job?


Yes, but I don't tile bathrooms.


No

That would require hard work, skill and
application... tiles don't stick themselves to the
wall by yakking rubbish at them

I am sure you have talked many a tile onto the wall.
What is your grouting like?
 
It would be foolish to offer 'educated' advice as I have not visited your property (unlike some on this site). So i would like to offer you some food for thought. WB Highflow 440 or a good unvented system, why not? But, I have worked on a large property in the past and fitted 2 combi's, 1 for the upstairs and 1 for the downstairs, both on their own programmers, making quite a versatile set-up. My own WB 37CDI manages well in a 1925, 4 bedroom, 2 showers and 1 bath. 2 adults & 3 kids. Do as one wise person as already said, get 3 or 4 people round to give you advice and quotes, then make your decisions After all you may be stuck with it for the next 10 years!
 
Do as one wise person as already said, get 3 or 4 people round to give you advice and quotes, then make your decisions After all you may be stuck with it for the next 10 years!

Quite ;)
 
That's it WS, go and plumb in the garden too!
If a whole bath is run off and the store temperature
is around 10C

You don't even know your own product you're trying to recommend?!? The store will never hit 10c because to do so the user would have to have been running lukewarm water out of his hot water taps for the last 20 mins.

Perhaps that's what heat bank customers do - think "I need some water at 10c, I'll just switch the hot tap on and wait for the water to cool".

Then you go and say "LARGE BOILERS CAN BE USED WITHOUT ADVERSE EFFECTS". If I wanted a large boiler I'd get a highflow combi. Thanks for a completely useless benefit, like most of the others.

Perhaps we can end this conversation with a quick trivia question:
Q. What heating product is commonly referred to as a "sludge bucket"?

You can see 'em queuing up to buy one :)
 
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