"Commander Kinsey" wrote in message
newsp.z920w4gywdg98l@glass...
On Tue, 22 Oct 2019 01:23:42 +0100, Rod Speed
wrote:



"Commander Kinsey" wrote in message
newsp.z91agyq1wdg98l@glass...
On Tue, 22 Oct 2019 00:12:33 +0100, Rod Speed
wrote:



"Commander Kinsey" wrote in message
newsp.z903zpzpwdg98l@glass...
On Mon, 21 Oct 2019 21:59:03 +0100, Robert
wrote:

On 21/10/2019 20:54, Rod Speed wrote:
Commander Kinsey wrote
Why can't I find a heat pump with a good SEER rating? The USA has a
law stating 13 minimum. Yet here in the UK, I looked at Panasonic
and
they're all 7 to 11!

https://en.wikipedia.org/wiki/Season...ficiency_ratio
Which suggests that the seasonal weighting parameters used in the US
,
Europe and possibly UK are all different which will give very
different
figures.

Surely all SEER are the same,

Nope, the S is for SEASONAL and that varys a lot
between those areas. That soggy little frigid island
of yours is nothing like what is seen in Texas etc.

Its not unusual to get 10 days in a row over 40C here.

all EER are the same, and all COP are the same?

Those arent SEASONAL, stupid.

It does not make sense to have SEER be different depending where you
live.

Yes it does, because that's what you actually care about,
how well the various heat pumps will perform with your
seasonal conditions. If for example your winter overnight
minimums don't see the outside heat collector freeze up
because its big enough for your minimums, that's what
matters for you.

How then can a product have a rating?

By measuring how well it handles low temps etc with a winter heat pump.

They don't know whether you're going to install it in Texas or wherever.

But that's why the USA has different SEERs to europe for the same device.

They'd have to say "SEER (Texas) 17, SEER (Washington) 15" etc.

It doesn't vary that much with summer cooling but it does with winter
heating.

And with summer cooling with swamp coolers too.

It's a rather crude rating but better than nothing.

It's pointless to have a rating of "SEER 12" if it doesn't specify where
that is.

While that is strictly true, its also seen with the ratings for fridges and
freezers.

Either SEER has to be the same the world over,

Not possible given that climate does vary so dramatically.

or it needs to specify what country on the rating.

Doesn't work so well with the tiny little countrys like in europe.

Or the massive ones like the USA and Oz.

I could otherwise be comparing two units, one with a SEER measured in
America and one in the UK.

Yes but you wouldn't normally do that with a
heat pump because of the mains differences etc.

There is ISEER for India, there should be similar letters to prefix it for
each country, or the rating is meaningless (incomparable).

Yep, there is no real solution to that problem.