Heat Pump Sizing?

Spies

silverwhistle said:

Spies said:

For me its the ability to get rid of the Gas meter as well as the standing charge, A2A would mean I'd still have to have a gas meter for the combi boiler in order to have hot water.

I've got an immersion and any spare solar gets diverted to it, so for me no need. Even in winter I get some input and would then top up when electricty is cheap.

Saving gas standing charge to the tune of £115 a year isn't of interest to you? 

matt_drummer

Spies said:

silverwhistle said:

Spies said:

For me its the ability to get rid of the Gas meter as well as the standing charge, A2A would mean I'd still have to have a gas meter for the combi boiler in order to have hot water.

I've got an immersion and any spare solar gets diverted to it, so for me no need. Even in winter I get some input and would then top up when electricty is cheap.

Saving gas standing charge to the tune of £115 a year isn't of interest to you? 

Maybe you should ask, isn't heating your house and DHW for less than half the price of gas, saving the gas standing charge and getting a grant of £7,500 towards a new heating system of interest to you?

michaels

matt_drummer said:

Spies said:

silverwhistle said:

Spies said:

For me its the ability to get rid of the Gas meter as well as the standing charge, A2A would mean I'd still have to have a gas meter for the combi boiler in order to have hot water.

I've got an immersion and any spare solar gets diverted to it, so for me no need. Even in winter I get some input and would then top up when electricty is cheap.

Saving gas standing charge to the tune of £115 a year isn't of interest to you? 

Maybe you should ask, isn't heating your house and DHW for less than half the price of gas, saving the gas standing charge and getting a grant of £7,500 towards a new heating system of interest to you?

It was of interest to me, until I was told that it would be 19k after the grant to get the set up I wanted...

We do our 20kwh of hot water by immersion using electricity at 8p per unit.  Using a heat pump at a cop of 3 would save 389 a year over that or £214 over using gas (perhaps a bit more due to gas not being 100% efficient).

Even if we saved twice that on space heating, 600-700 a year saving has a long payback period when the heat pump would cost 15-16k more than simply replacing the gas boiler....

matt_drummer

michaels said:

matt_drummer said:

Spies said:

silverwhistle said:

Spies said:

For me its the ability to get rid of the Gas meter as well as the standing charge, A2A would mean I'd still have to have a gas meter for the combi boiler in order to have hot water.

I've got an immersion and any spare solar gets diverted to it, so for me no need. Even in winter I get some input and would then top up when electricty is cheap.

Saving gas standing charge to the tune of £115 a year isn't of interest to you? 

Maybe you should ask, isn't heating your house and DHW for less than half the price of gas, saving the gas standing charge and getting a grant of £7,500 towards a new heating system of interest to you?

It was of interest to me, until I was told that it would be 19k after the grant to get the set up I wanted...

We do our 20kwh of hot water by immersion using electricity at 8p per unit.  Using a heat pump at a cop of 3 would save 389 a year over that or £214 over using gas (perhaps a bit more due to gas not being 100% efficient).

Even if we saved twice that on space heating, 600-700 a year saving has a long payback period when the heat pump would cost 15-16k more than simply replacing the gas boiler....

The question wasn't directed at you, it was what @Spies was asking @silverwhistle

I thought you were getting a `Dream' heat pump and installing it yourself for a fraction of@silverwhistle

How can it possibly cost £26,500 to install a heat pump at your house?

I thought your net cost from Octopus was £4,000?

If I recall, it's not a huge house?

michaels

matt_drummer said:

michaels said:

matt_drummer said:

Spies said:

silverwhistle said:

Spies said:

For me its the ability to get rid of the Gas meter as well as the standing charge, A2A would mean I'd still have to have a gas meter for the combi boiler in order to have hot water.

I've got an immersion and any spare solar gets diverted to it, so for me no need. Even in winter I get some input and would then top up when electricty is cheap.

Saving gas standing charge to the tune of £115 a year isn't of interest to you? 

Maybe you should ask, isn't heating your house and DHW for less than half the price of gas, saving the gas standing charge and getting a grant of £7,500 towards a new heating system of interest to you?

It was of interest to me, until I was told that it would be 19k after the grant to get the set up I wanted...

We do our 20kwh of hot water by immersion using electricity at 8p per unit.  Using a heat pump at a cop of 3 would save 389 a year over that or £214 over using gas (perhaps a bit more due to gas not being 100% efficient).

Even if we saved twice that on space heating, 600-700 a year saving has a long payback period when the heat pump would cost 15-16k more than simply replacing the gas boiler....

The question wasn't directed at you, it was what @Spies was asking @silverwhistle

 I thought you were getting a `Dream' heat pump and installing it yourself for a fraction of the cost?

I realise it wasn't for me but thought some numbers as they work for me might be of interest to the general conversation.  As big users and with the advantage of considerably battery storage, we should potentially also be able to make big savings.

 Currently I have hooked up an ancient second hand Grant HP but it has an issue with a reading from one of the sensors.  Am exploring an alternative but much newer second hand unit. 

Your comment now made me think about how I connect it.  Currently have it teed into a radiator so on 15mm where it meets the central heating circuit but I could do a long run and then tee in to the 22mm.

matt_drummer

I remember you had an old Grant connected last year.

Where is it, on your garage roof or somewhere else?

michaels

matt_drummer said:

I remember you had an old Grant connected last year.

Where is it, on your garage roof or somewhere else?

Somewhere else, it is a bit of a big noisy brute so suspect we would get complaints if we put it on the garage roof as it is visible from the road - although some sort of screening might help - I have seen 'heat pump covers' advertised - I wonder if they cause problems because they restrict the air flow?

Aluminum Air Conditioner and Heat Pump Cover ,Mini Split Air Conditioner Cover for Outside Units ,Shelf Plant Stand ,Outdoor AC Unit Cover , Noise Reduction ,suitable for outdoor ( Color : Gray flat r : Amazon.co.uk: Home & Kitchen

matt_drummer

Covers and enclosures do work but I think they need careful design.

A heat pump being visible from the road is no issue at all. As long as the heat pump is no higher than first floor level and it's not a conservation zone or listed building, facing a road is permitted development.

My heat pump is on the front of my house facing the road.

Have you had any advice in regards to planning permission?

FreeBear

michaels said: We do our 20kwh of hot water by immersion using electricity at 8p per unit.  Using a heat pump at a cop of 3 would save 389 a year over that or £214 over using gas (perhaps a bit more due to gas not being 100% efficient).

Just crunched some numbers based on running a bath on Sunday. Used 90l of water heated from 18.7°C to 44

°C and consumed 3.37kWh to do so. This works out to roughly 78.6% efficiency.

Boiler is a Viessmann 050, just over a year old, and recently serviced.

michaels

matt_drummer said:

Covers and enclosures do work but I think they need careful design.

A heat pump being visible from the road is no issue at all. As long as the heat pump is no higher than first floor level and it's not a conservation zone or listed building, facing a road is permitted development.

My heat pump is on the front of my house facing the road.

Have you had any advice in regards to planning permission?

Local councillor said they had no specific policy with regards to heat pumps.  There is a 'guideline' that you can only build to the neighbouring boundary at ground floor level and need a 1m set back at first floor level.  It would be onto this setback that I would want to site the heat pump so it would therefore fail the 'at least 1m gap at first floor level' 'rule'.  This rule is to prevent the street taking on a 'terraced appearance' so it could be argued that simply adding a heat pump does not really create such an effect.  I can pay about 400 quid to ask a planner for their thoughts within 12 weeks and then a similar amount to apply for planning which takes up to 6 months or just go straight for planning and save the 400 but have to wait the 6 months,