On 27/10/2024 11:41, jon wrote:
> On Sun, 27 Oct 2024 11:21:06 +0000, The Natural Philosopher wrote:
>
>> On 26/10/2024 21:44, Joe wrote:
>>> On 26 Oct 2024 20:30:15 GMT Tim+ wrote:
>>>
>>>
>>>
>>>> In an ideal world I’d like a heat pump that could be a straight swap
>>>> for my existing gas boiler that would cost no more to run than my gas
>>>> one with no (or at least minimal) system modifications.
>>>>
>>>>
>>> Wouldn't we all? If that were the case, they would sell like hot cakes.
>>>
>>> They may (at the moment) be much more efficient than gas boilers, but
>>> their heat output is so much lower that they need to be run more of the
>>> time to do the same job, or need to be much bigger and noisier. And
>>> even then, they are not great when it's really cold outside.
>>>
>> The problem is that 'renewable' electricity is three to five times the
>> price of the gas.,
>>
>> And when you most need heat - at subzero temperatures - the heat pumps
>> fail to offer any significant power output and need to be supplemented
>> with actual real electrical heating elements
>>
>> Now a good ground sourced installation is way better but you are looking
>> at a capital cost far exceeding the ongoing cost of gas.
>>
>>> Of course, it may just be market segmentation: when all the people with
>>> silly money to burn have burned it, maybe they'll start selling to less
>>> well-off people at a rather lower cost.
>>>
>> The real gains are in the massive insulation required in new builds.
>> There heat pumps may be adequate.
>>
>> But not as retrofits to existing properties designed for 60°C water
>> temperatures in the CH.
>
> On the contrary, my Heat Pump never has the immersions on, they are
> disabled at the CU. I get ~54C generated for DHW and Heating with only
> circulation through the system. As for 'Legionaires' no sign yet in
> several years operation.
The immersion heaters are within the heat pump itself
It is not possible to pump from say 5°C to 54°C with a single heat pump
stage
--
I was brought up to believe that you should never give offence if you
can avoid it; the new culture tells us you should always take offence if
you can. There are now experts in the art of taking offence, indeed
whole academic subjects, such as 'gender studies', devoted to it.
Sir Roger Scruton
|
|