This adds a whole new level to heating - not simply adjusting the thermostat. But looking at predicted weather and making adjustments

Nice thorough explanation of some of the finer points of the installation that most people would never understand.

Very interesting, thank you from a Dutch viewer. I have the same problems with my Daikin heat pump.

Thank you for sharing. Brilliant information

The margins between an oil fired central heating system and an air sourced heat pump at the moment seem to be small and constantly moving. Given that the savings/year will not be vast I would suggest that a changeover of heating system should only be considered at a point where a replacement of an oil boiler has become essential. Like cars one of the biggest costs of heating systems is that of depreciation. Unlike a car the value of a secondhand oil boiler is minimal as the cost of installation probably means that most people would rather buy new than take the chance of installing a secondhand boiler. This means that there is no or very little offset against the cost when purchasing a replacement heating system. Therefore it is probably a waste of money at the moment to change ahead of the end of life of the boiler. If a an oil boiler is about 90% efficient and the price is 90p/litre, as the heat energy in one litre of oil is about 10kwh, electricity would need to be below 8.1p/kwh for conventional electricity heating. For a COP of 4 this would become about 32p/unit which is much more achievable. Given the present fluctuations in the energy market I guess it will be at least a couple of years before we can make meaningful decisions on our choices of heat energy from an economic point of view. Certainly even if we just break even the air sourced heat pump would be a good choice from an environmental point of view.

Currently I'm paying 24.7p per kwh for electricity and 10.4p per kwh for gas; my 35 year old boiler is 80% efficient so in effect I pay 13p per kwh to heat my house with gas. I think in future gas will increase in price faster than electricity as green levies are placed on fossil fuels. 2 years ago I had rooftop solar and a powerwall installed which generates about 5500kwh per year, I currently export about half of that amount to the grid. Next year I plan to get an ASHP (probably a Vaillant) and hope it will be able to get a SCOP of around 3.5. My excess solar should go a long way to cover the cost of running the heat pump. I would definitely recommend solar and a battery to anyone with a heat pump.

@ecoterrorist1402

Жыл бұрын

"My excess solar should go a long way to cover the cost of running the heat pump" only in the summer months

@hazmat5749

Жыл бұрын

@@ecoterrorist1402 No, I'm on the Tesla energy tariff which allows me to import and export at the same price. In the summer months I export a vast amount of surplus electricity which I can then buy back at the same price in the winter months when I need it for the heat pump.

Very interesting thanks for sharing

21deg. Just wondering why you need such a high temperature. In our house 18c is hot. Also, you have radiators under windows with curtains hanging over them, I would relocate the rads, or extend the window call boards and cut the curtains above.

Informative video and although a bit technical I could see how you approach your own situation. We have 3 ASHP's in our bungalow and have them set to go no higher than 18c ,we rely on these units as our boiler and rads are now decommissioned and scheduled to be fully removed next year. We're looking at solar and battery tech for our next project. A question on your ASHP's, why are they positioned in your garden area instead of fixed to the main house ? Is it due to your house being of a certain age ? Peter

@modernthatchliving1025

Жыл бұрын

We placed the heat pumps where they are partly because the water generated on the defrost cycle will not be near the house so less potential for ice formation on the path and green algae growth, partly because the air flow round the unit will be good, partly because we had a concrete pad where the oil tank used to be, but mainly because we just thought it looked better to have them away from the house under the willow tree...perhaps not everyone's taste but when the willow tree is in full leaf they are somewhat hidden. Thank you for watching!

Are you making dhw with your ashp? Thank you John.

@ Modern Thatch Living. Firstly, thank you very much for such an informative video; there are very few posts with this level of analysis, so I really appreciate your effort. The question I have relates to your "Example calculated flow temperatures for our system..." graph, with time stamp 8:39: are you showing return flow temperatures (for example 29 degrees at 0 degrees outside) or heat pump-generated input temperatures into the manifold? Many thanks.

@modernthatchliving1025

Жыл бұрын

It is the predicted required return flow temperature, the system then uses that information to set the actual flow temperature depended on the outside temperature. That is, it is the flow temperature required to be circulating around the house to balance the heat loss from the building and maintain a constant temperature. I hope that helps and thank you for watching!

@A.P.Garland

Жыл бұрын

@@modernthatchliving1025 Excellent. Thank you. I find (depending on the flow rate) that my return manifold temperatures are about 10 degrees lower than those entering the manifold from the heat pump at about 0 degrees outside.

@modernthatchliving1025

Жыл бұрын

@@A.P.Garland Just to clarify my use of "return" in the comment above. I meant return to the house and the temperature of the water circulating round the house, but the heat pump manual uses "return" as the return to the pump...sorry if I have confused anyone and for my sloppy use of "return".

@A.P.Garland

Жыл бұрын

@@modernthatchliving1025 Thank you. Understood.

@burakokumus6040

Жыл бұрын

@@A.P.Garland If you have 10 degrees of delta between the supply and return flows, you are possibly running your heat pump at high flow temperatures (a slow circulation pump can lead to same issue). The lower the flow temperature , the lower the delta between supply and return. Some heat pumps lets you control the flow temp and some not. Controlling flow temp is a lot more efficient and economic way to use a ehat pump. By the way keep that in mind, with a heat pump the lower the delta between suply and return flow, the happier the compressor! Preferred delta is 5C for heat pumps.

Thanks for the explanation. Was the clip of the defrosting in real time?

@modernthatchliving1025

Жыл бұрын

The clip was x5 real time. Thank you for watching and subscribing!

wait, isnt that the house Artisan Electrics rewired some months ago?

Just received an £3500 quote for a new oil tank installation as it needs moving and replacing due to regulatory changes. Team that with an 20 year old boiler, I'd be in for at least £10k.. So been looking at ASHP for a while, main benefits I don't have a commodity in my garden which could be stolen, yes electric is expensive but when crunching numbers over filling my oil tank, having it replaced, running the heating etc then ASHP is a no brainer. Just spend some time draught proofing your home if it's old like mine.

@markthomasson5077

Жыл бұрын

If draught proofing an old house, at same time you may need to improve ventilation with of course heat recovery

I didn't quite catch the name of the fan unit in the room with the wood burner in. Could you provide a link in the description please.

@modernthatchliving1025

Жыл бұрын

It is a fan coil unit by Jaga. jaga.co.uk/wall-mounted-heaters-radiators thanks for watching!

@ADayWithoutYesterday

Жыл бұрын

@@modernthatchliving1025 Thanks.

How does this work for a air handler system and not radiators? If a system is rated for a COP is that at a certain temperature?

Electric cost is linked to gas costs which are similar to oil. So they should in theory both change together. Of course as more renewables come into the equation, electric will be more stable, and we hope less. So ASHP should make economic sense in time.

If you got a large battery and charger it at 12p. Then run the heat pump off that

As a solar installer, I can only share that the sooner you install PV the quicker the payback. My advice would be to avoid Chinese brands and stick to well reputed panel manufacturers like Sharp, Hyundai, Solarwatt, REC, ALEO or Panasonic and Inverter brands like Enphase or SolarEdge. If a battery is on the cards, I'd suggest Tesla or a MyEnergi Libbi as the most future proof solutions.

@MT-xy7fw

Жыл бұрын

You're a joker! My solar setup is all chinese branded and it's been excellent. You dont even know myenergi libbi is a re-branded chinese product lol

@singlendhot8628

Жыл бұрын

@@MT-xy7fw It's quite common to see people who've invested in Chinese brands to defend them, even though they often lack any awareness of what they're buying or who they are buying from (let alone a conscience about the real world ramifications of their purchase). What most don't see is the number of people who quietly cough up the £ to replace failed components due to warranty claims not honoured. As an installer, I come across all kinds, but always try to move my customers away from brands that don't know the meaning of customer service - it may be a coincidence that nearly all are Chinese owned. The K-Star battery on which the Libbi is based a quality unit - I've installed a few. But the Libbi integrates with their products seamlessly (I've experienced it during installation training). The company is also excellent so I am happy to suggest my customers buy these.

@MrButuz

Жыл бұрын

Hahah - more like "As a solar installer I am going to recommend the devices I make maximum profit on installing i.e. the overpriced micro inverter/optimiser based systems that I can make 4 times the profit supplying to mugs who have zero shading and would be far better off with a nice SMA string inverter at well under half the price" Nice try!

very nice job with the video. I would ask if you have considered the cost of professionally cleaning the heat pumps because that will greatly affect your COP. Also, do you have a budget for service when the need arrises?

@modernthatchliving1025

Жыл бұрын

Yes, we get them serviced on an annual basis just as we did with the oil boilers when we had them. So far the difference in servicing costs have not been that different.

All this should have setup in the design.

I agree, BRILLIANT Happy for you.. But , let's get it right.. Only those with enough excess CASH can live this life. YES IT CAN WORK but only after huge fiscal input. All of the videos feature the same people. Nothing wrong with these people, good people. But the up front cost is huge .

Interesting video for sure. If you were very happy with saving 10 quid a day by tweaking your heat pump temperatures then your electricity bill must be absolutely monumental?? It seems a common theme with honest heat pump videos like yours is that if you do not own a solar system - it's no cheaper than oil a lot of the time - especially if you factor in the fact that your existing oil system is working fine, it doesn't make sense to me to then go spend £10k on heat pumps just to save a few quid here and there in bills? Lots of people seem to be doing just that nowadays! Get as much solar as you can fit ASAP and watch your bills drop like a stone.

Solar, of course you won’t get much benefit when you really need it. Although if you have an EV that is different. Perhaps putting some investment in a community wind farm makes more sense, if only on a green agenda. Ps, good revue, though I have to admit putting you on 1.25x speed, no criticism, you are just a happy relaxed guy.