Taking the plunge Daiken Altherma HT

mario2013

Thanks for posting the link Cardew, this is the new public dashboard but there is another version that i have the link for which is alot more detailed and has many other sites but cant post it still.

I think its good that there is something out there showing credible data that heat pumps do work well if the basics are adhered to.

Cardew

mario2013 wrote: »

Thanks for posting the link Cardew, this is the new public dashboard but there is another version that i have the link for which is alot more detailed and has many other sites but cant post it still.

I think its good that there is something out there showing credible data that heat pumps do work well if the basics are adhered to.

Whilst I don't doubt the accuracy of the statistics, am I correct that the COP quoted is only for heating and not hot water?

Also it is hardly a random selection of properties. You can bet your bottom dollar that they only use the properties that show their system in a good light.

The fact remains that people spending £10,000 or more, are still taking pot luck that they get a system that performs satisfactorily.

[Deleted User]

Cardew wrote: »

Whilst I don't doubt the accuracy of the statistics, am I correct that the COP quoted is only for heating and not hot water?

Also it is hardly a random selection of properties. You can bet your bottom dollar that they only use the properties that show their system in a good light.

The fact remains that people spending £10,000 or more, are still taking pot luck that they get a system that performs satisfactorily.

Correct - that's why the don't monitor my expensive to run ASHP, they cherry pick this installs

Hopefully DECC/EST will forget about monitoring mine :whistle:

mario2013

How many posts do i have to make until i can add a link? there is a massive range of properties on the full engineering dashboard which i am looking at now, the one you are seeing has four properties on there at the moment? on the other website most properties are showing decent performance, some exceptional and some not so good with a wide range of locations and housetypes, all including DHW, auxillary usage, defrost etc.

I dont agree it should be pot luck if all the key aspects of system design, installation commissioning and handover are covered and that decent equipment is used.

Although i agree with the fact it must seem that way to someone considering installing a heat pump, if you get a bad installer who has not bothered to put into practice any of the above then the heat pump will show up all the problems and poor workmanship that a high temperature, high capacity fossil fuel boiler will easily hide.

Cardew

Nobody disputes that an Ecodan properly installed in a suitable house works.

The problem is that there is no guarantee that it will perform satifactorily; and no easy way for the customer to check, other than complaining of high bills.

We can't ignore the EST annual trial, published Sept 2010 that stated only 13% of ASHPs performed well.

If Mitsubishi allow anyone to purchase and install their equipment without them(Mitsubishi) taking responsibility, then they are culpable.

When we have paid out £thousands there is something in the psyche of most of us that makes us defend our decision. I don't think I have read a complimentary review of ASHPs from those in Council/HA properties.

How many ASHP installers would turn down an opportunity to install a system because the house is not suitable?

Another issue 'glossed over' is that the ASHP must run most/all of the day and night to maintain the house temperature. i.e. it just doesn't have the capability of bring the house quickly up to temperature like gas/oil CH. So if you are out at work, or when in bed, that heat is effectively wasted.

mindovermatter

Hi Cardew,

You give excellent advice - I was thinking about ASHP but I have now decided against it - we live in a detached stone built house in Devon and the heat loss is high.

So what options have I got left - we are currently on LPG (79pl) - help!

Biomass is not an option as we just haven't got the space for bulk storage.

Best wishes

Mindovermatter

[Deleted User]

mindovermatter wrote: »

Hi Cardew,

You give excellent advice - I was thinking about ASHP but I have now decided against it - we live in a detached stone built house in Devon and the heat loss is high.

So what options have I got left - we are currently on LPG (79pl) - help!

Biomass is not an option as we just haven't got the space for bulk storage.

Best wishes

Mindovermatter

I would have thought the best/cheapest option is to change LPG supplier with a target of 30p off a litre [79p] with some free gas chucked in...

Cheers

mindovermatter

Hi Jeepjunkie,

We wanted to get rid of lpg but I think you are right.

Just done a quick google search and found 54p plus vat already.

cultsmill

I installed a Daikin Altherma HT unit 16kW to replace the oil fired heating we installed when the house was built. The oil fired system worked a treat but was getting on for 15 years old so we opted to have an ASHP installed. We have underfloor heating throughout the property.
So far it has not been the best, when the temperature goes down to -15 as it did last yer you might as well shut it down as it generates no heat, even after defrosting the ice build up. The biggest issue we have is the electricty bills last year £2500 this year £3600, neither economic to run or energy efficient. Having paid £16000 to have it installed just adds to the feeling that this is not a technology that has been fully proven.

dullnote

Carded is right, ASHP are great if they are in the correct house, and don't compare to traditional boiler. ASHP produce low grade heat IE it is slow to warm the house up, but under the correct circumstances that is fine.

I work from home therefore at home most of the time, we have underfloor heating throughout again this is slower to heat compared with traditional. I am happy with the unit running 24/7, it does cut back for night periods.

Installers need to say if the system is right for the house or not, this would be short term pain but long term gain, sticking them in the wrong type of house/ or the clients not fully aware on the possible life style changes.

All thing being equal ASHP at great in the correct place, my heating bill from £2k down to £750, again in this thred the excludes hot water, pump running at 35 degrees hot water done by LPG boiler, running for 30min cost approx 50p a day, summertime this will drop as the soler panels will kick in.

Dullnote