How much does a modern boiler save?

TUVOK

I still have a 1995 boiler which according to my boiler maintenance engineer is working perfectly.
I am well aware that I could save on costs if I replaced it with a modern boiler.

In order to give me some insight into what savings with a replacement modern boiler against cost and installation of of a new boiler, can any members give me some idea of savings if they have replaced their old boiler.
Two people including myself live in my 1995 build semi detached house, and heating in a normal winter is restricted to evenings only.

Mstty

How long is a piece of string

Some older boilers circa 1995 could be 60-80% efficient. A new modern boiler combi setup correctly 98% efficient.

So you could save 2-3p kWh on gas with a new boiler.

If you know your annual boiler usage that's your info for return on investment 

lohr500

To have a stab at calculating the possible saving, we would need to know your annual gas usage in kWh and the make/model of your old boiler. (Assuming it is a gas boiler. Also. are you using gas for cooking and/or do you have any gas fires?

matelodave

What boiler have you got, just because its a 1995 model it doesn't necessarily follow that it's significantly less efficient than a more modern one. We had a condensing boiler in 1995 which was around 85% efficient and nowadays you'll probably get 90-95% if you have it set up properly  and use it correctly.

Say you get a 10% improvement and your heating bill is £1000 a year, then you could possibly save £100. If a new boiler costs you £2000 then it would take 20 years to get your money back. Obviously if your present bill is £2000 a year then you'd get a return in about ten years

There are no hard and fast rules so you need to do the sums, if its a cranky old boiler with a pilot light then your saving's are likely to be higher, likewise you need to gets some quotes to see how much a new boiler and controls is likely to cost in your house rather than a random ball park figure - ask your boiler engineer.

ctdctd

I changed from a 1980's Baxi Bermuda back boiler to a Worcester Bosch condensing combi a few years ago and I reckon my total gas usage has fallen about 25% since then. 

InvertedVee

ctdctd said:

I changed from a 1980's Baxi Bermuda back boiler to a Worcester Bosch condensing combi a few years ago and I reckon my total gas usage has fallen about 25% since then. 

Bermuda is a great name for a boiler!

Mstty

M0KBJ said:

ctdctd said:

I changed from a 1980's Baxi Bermuda back boiler to a Worcester Bosch condensing combi a few years ago and I reckon my total gas usage has fallen about 25% since then. 

Bermuda is a great name for a boiler!

Maybe you would be interested in the Valiant Volcano?

[Deleted User]

This link explains why many condensing boilers rarely condense. Efficiency increases as the return water flow temperature reduces. Condensing boilers are not in themselves efficient. They have to run on a properly set up system. 

https://www.theheatinghub.co.uk/why-our-condensing-boilers-do-not-condense

MuckChucker

New boiler and cylinder back in February - old boiler was a dear old dog (25+ yrs), I think the house was actually built around it (hopefully not considering it's a 1970s house) and it was a hell of a job getting it out. New boiler is a Veissmann 19kw heat only. House is a 4 bed semi in Essex. 2 adult and 2 kids under 7 years. Here are some actual figures

Gas consumption has fallen off a cliff!


With the crazy prices rises it doesn't look like a saving but I shiver to think what we would be doing/paying had we not swapped it out.

Mstty

MuckChucker said:

New boiler and cylinder back in February - old boiler was a dear old dog (25+ yrs), I think the house was actually built around it (hopefully not considering it's a 1970s house) and it was a hell of a job getting it out. New boiler is a Veissmann 19kw heat only. House is a 4 bed semi in Essex. 2 adult and 2 kids under 7 years. Here are some actual figures

Gas consumption has fallen off a cliff!


With the crazy prices rises it doesn't look like a saving but I shiver to think what we would be doing/paying had we not swapped it out.

Don't forget extremely mild October and November. December will be the real comparison point through til end of March.

pensionpawn

TUVOK said:

I still have a 1995 boiler which according to my boiler maintenance engineer is working perfectly.
I am well aware that I could save on costs if I replaced it with a modern boiler.

In order to give me some insight into what savings with a replacement modern boiler against cost and installation of of a new boiler, can any members give me some idea of savings if they have replaced their old boiler.
Two people including myself live in my 1995 build semi detached house, and heating in a normal winter is restricted to evenings only.

In early October I replaced my 26 year old Ideal Classic with a Viessmann hydrogen ready condensing boiler with adjustable flow temperature (and wifi for ease of performance data access). Why? Firstly it's getting more costly to maintain / service and probably would have suffered terminal failure in this cold snap. Why continue to throw good money at an ageing boiler to keep it going at an efficiency well below its original rating. Secondly my (everyone's?) gas rate has tripled / quadrupled over the last 15 months so why not invest to save. At the current energy cost point I have an ROI of around 6 years, which I never expected for a new gas boiler. You should burn 40% less gas.