How much does a modern boiler save?

ChaunceyGardiner

Mstty said:

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?

Or an Ideal Mexico?

TUVOK

Many thanks for all of the replies to my query.
They are so helpful in giving insights into my present heating system and what is possible with a new one.

Great site and forum, members so helpful.

Ally_E.

Mstty said:

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.

October and November were milder while December is much colder than previous years. We're not getting like for like comparisons here either way. 

Grandad2b

matelodave said:

A heat pump wont necessarily save you money because leccy is around 3.5 times the price of gas at the moment and if you only turn it on a for a couple of hours a night then you wont see the benefit of longer running times at very low flow temperatures.

I've got a heatpump, had it for 12 years and I'm very happy with it but it's not everso cheap to run, especially when its very cold. If gas was available where I live then that's what I'd have

Yesterday the HP chewed through 48kwh of leccy at 35.5p/kwh = £17. I'm guessing that if I was lucky enough to get a COP of 2.5 that might equate to around 120kwh of gas at 10.33p/kwh = £12.40.

You'd have to have a really naff boiler to cost as much as a heat pump when it's really cold. Even with a COP of 3 that 120kwh would have cost £14.20 with a heatpump

As I said above, you really do need to do your sums and to work out what suits your lifestyle and budget.

All this is true. But, that electric cost is assuming you're on a same price all the time tariff and have no possibility of installing PV and storage. In winter, particularly when the sun's not shining, the low COP and high electric price would still be working  against you unless you can charge your battery at a lower rate. And, presumably the ASHP needs to be running 24/7 in the heating season. 

A question for you - can you use your heatpump for cooling in the summer or is that something that would be more applicable to ground source?