Boiler change?

brainbug100

Evening all,

I currently have a Ferroli Optima 901 boiler which according to boilers.org has a 70.5% efficiency rating. search on boilers.org and it shows the 900 near as dam it too mine I think

I currently use 8800- 9000 Kwh's of gas per year, and am wondering if a newer more efficient boiler would really make any noticeable difference?

Many Thanks

unclebulgaria

Well modern boilers run at (according to the manufacturers instructions) 91% so I would think so.

brainbug100

unclebulgaria wrote: »

Well modern boilers run at (according to the manufacturers instructions) 91% so I would think so.

So in theory 20% saving per year which on my annual costs of £600 would be £120 but then a new boiler at say £1500-£2000 (have no real idea) it would take 10 years to claw back the cost?

Assuming my maths is right

Thanks

unclebulgaria

Well thats possible but you have to remember that gas prices rise and have been rising a lot so that wouldn't work quite so easily.
Generally the answer is yes.

macman

Given your low usage (only about two third of the average) it will indeed take 10 years or more to get back the investment.
But given that it's a Ferroli, it'll probably make the decision for you, as it won't last that long!
Otherwise keep it until it becomes unreliable and expensive-which may not be too long.

brainbug100

macman wrote: »

Given your low usage (only about two third of the average) it will indeed take 10 years or more to get back the investment.
But given that it's a Ferroli, it'll probably make the decision for you, as it won't last that long!
Otherwise keep it until it becomes unreliable and expensive-which may not be too long.

Ill tempt fate and say 1. I'm renting and 2. been 2 years and touch wood...................................

Thanks all for the advice

macman

So if you are renting, why is a boiler change a consideration? It's down to your landlord.

C_Mababejive

What do you mean by efficiency? The word efficiency is just a throw away marketing tool used to flog more boilers.

brainbug100

macman wrote: »

So if you are renting, why is a boiler change a consideration? It's down to your landlord.

Its more because its my bills and if it was cheap to run I would advise him (my friend / landlord) to look at the options

HappyMJ

brainbug100 wrote: »

Its more because its my bills and if it was cheap to run I would advise him (my friend / landlord) to look at the options

The landlord does not care about your bills...the landlord is looking at his own bottom line. Spending money on a boiler on which he will never se a return is not a good investment. Renters will not pay more for a property with a 91% efficient boiler over one with a boiler that is 70% efficient. The most you could save is £5 per month anyway.

9,000kWh input gas at 70.5% efficiency gives you 6,345kWh of usable heat

6,345kWh of usable heat on a 91% efficient boiler would need 6,973kWh of input gas. Your reduction is therefore about 2,000kWh per year. This would all be at the secondary rate of 3.5p/kWh saving you about £70 per year. Save for a bit of rounding and reduced efficiency when not condensing during start up you would save about £5 per month. The landlord's increased costs spending what you estimate at an average figure of £1,750 to install a new boiler would require the rent to increase by at least £10 per month to recover the money over the lifetime of the boiler (15 years) and that's not counting the loss of interest on the money if he had just left it in the bank. It isn't worth it.

brainbug100

HappyMJ wrote: »

The landlord does not care about your bills...the landlord is looking at his own bottom line. Spending money on a boiler on which he will never se a return is not a good investment. Renters will not pay more for a property with a 91% efficient boiler over one with a boiler that is 70% efficient. The most you could save is £5 per month anyway.

9,000kWh input gas at 70.5% efficiency gives you 6,345kWh of usable heat

6,345kWh of usable heat on a 91% efficient boiler would need 6,973kWh of input gas. Your reduction is therefore about 2,000kWh per year. This would all be at the secondary rate of 3.5p/kWh saving you about £70 per year. Save for a bit of rounding and reduced efficiency when not condensing during start up you would save about £5 per month. The landlord's increased costs spending what you estimate at an average figure of £1,750 to install a new boiler would require the rent to increase by at least £10 per month to recover the money over the lifetime of the boiler (15 years) and that's not counting the loss of interest on the money if he had just left it in the bank. It isn't worth it.

Wow thank you for your informative answer, that's exactly what I was wondering, £5 per month is nothing really then. Like a previous post you see "efficiency" and you think savings, but I suppose not that much. Least its not a back burning boiler so still cheaper than that,

Here's my latest forecast so I guess the saving might be even less!

Thanks again