Turn into a session did it? 
How to sell a boiler II
- Thread starter vulcancontinental
- Start date
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I described the method used to measure the efficiency of a boiler with the comment that for a few seconds after a hot water tap was turned on the measured efficiency is 0%
Dan Robinson's reply was
Dan, would you be able to explain why that test method and/or the period of zero efficiency can be described as nonsense.
Dan Robinson's reply was
Dan, would you be able to explain why that test method and/or the period of zero efficiency can be described as nonsense.
I'm saying your test is nonsense.
You figure out why.
You figure out why.
Not my test,
You make the accusation that it is nonsense yet you will not ( or cannot ) support that accusation.
A similar test but with less accurate results can be performed without any test equipment. Hold the DHW pipe at the boiler and ask someone to turn on a hot water tap. When the boiler fires up start counting seconds until the DHW pipe feels slightly warm. Remove hand from pipe.
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BG: we ALL know you hate combi's, we're over it! Why can't you be?
Eh??
You got home alright then??
It was meant as a quip about faking results but if it missed the mark, I'll have to work on my stand up routine
And, yes got home all good thanks... you get any call-outs?
Turn into a session did it?
Not on a school night Dan! Got to grout a bathroom this morning, then second fix... yay!
I don't hate combi boilers. They have a place in very small houses and flats where there is no space for a hot water cylinder. After all they were originally designed for just that application.
What I object to is "heating engineers" recommending a combi boiler be installed when when a conventional boiler would be more efficient given the life style of the people and the building.
They've come on a bit since then.
I have one, there are 5 of us, my house isn't very small, and I am in the trade - it performs just fine.
I have one, there are 5 of us, my house isn't very small, and I am in the trade - it performs just fine.
But they are still a combination of a high kW output hot water heater and a much lower kW central heating boiler. The design of combustion chambers and heat exchangers has improved but the extent of improvement is limited by the restraints imposed by the need to make a boiler at a price at which it can be sold. Hence there will always be a compromise between what is physically possible and what is commercially viable.
Altering the geometry of the burner and heat sink assembly between high kW and low kW operation would increase efficiency but would it be commercially unviable in the domestic market.
And what exactly is it going to achieve? Certainly not a measure of efficiency worth a jot.
And what we object to are pompous DIY'ers with very limited experience pontificating about something they know little about.
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Don't worry, No Intergas boiler was involved in the tests. You seem to be saying that accurate measurements of efficiency that produce genuine results are not worth a jot if they suggest the overall efficiency is or may be lower than the "value" used by marketing people.
Maybe limited experience but not zero experience. Working on systems for monitoring the operation of industrial heating equipment requires a good knowledge how boilers work.
Oh dear, indeed! I suggest you have another look at the manual - here's the relevant info:Take another look DH...the max gas consumption stated in the manual is 1.9m3/hr.
1.9/0.094=20.2kw/hr..
Oh dear.
Oh dear, indeed! You have been looking at the wrong manual - I have an OV boiler, not a system. Here is the relevant info from the Installation Manual:Take another look DH...the max gas consumption stated in the manual is 1.9m3/hr.
1.9/0.094=20.2kw/hr..
Oh dear.
(Don't know how the 2.7 got highlighted)
Boiler manufacturer is irrelevant.
No you doughnut. I'm saying your test will be meaningless.
Some one as proficient at googling should be a able to find the discussions that have already been had on this topic on this very forum.
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