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5 posts

Wannabe Geek


Topic # 238149 4-Jul-2018 21:54
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Considering getting one of these units installed to heat the hallway area into the bedrooms.

 

Does anyone have a recommendation or comparison in terms of performance and cost for these units?

 

Thanks in advance.


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  Reply # 2049296 4-Jul-2018 22:09
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First of all, why do you want a single heatpump in the hallway. Instead of just putting heatpumps in the bedrooms? As a heatpump in the hallway will struggle to accurately regulate the bedroom temperature. Especially if the bedrooms have different heating and cooling loads.

Also get a heatpump that uses R32 gas instead of R410a. As R410a is already getting phased out in Europe due to it having a high GWP compared to R32. Also R32 units have better energy efficiency.

GE series Mitsubishi use R410a, haven't checked what the quoted Daikin model uses. GL series Mitsubishi use R32.

Edit to add

Smaller capacity heatpumps generally have better COP figures (efficiency) than larger capacity models. So another reason to put a small heatpump in each bedroom. Instead of a large one in the hallway.





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  Reply # 2049596 5-Jul-2018 10:48
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I would find a heat pump in a bedroom too noisy, even on the quietest mode - at least for the large units we have.

 

We have a big heat pump in the lounge which heats the bedrooms from 3pm until people go to bed, from them small oil heaters are silent and effective. In my older but well insulated house we use about 1khw per hour to heat two bedrooms up to around 22 / 23 degrees for 8 hours, 8kwh = about $1.60 per night, or assuming six months a year that's $288. That includes all the other things in the house, fridge and underfloor heating in the bathroom and everything else on standby, no water heating / washing / drying / dishwasher. Two heat pumps would cost about $4000 installed (maybe more) and cut that bill to $0.50 per night. Saving $1.10 per night you take about 3500 days to pay back, 10 years. You do get the advantage of air conditioning as well though.





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Wannabe Geek


  Reply # 2049810 5-Jul-2018 13:54
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Hi Aredwood, ideally we would like to go down the ducted route however it's a big outlay of cash that i'm not prepared to part with at the moment so we're going to settle for a split system high wall unit in the hallway facing towards the back of the house and the 3 bedrooms which all have panel heaters installed. 

 

I've come to a crossroad in what size unit will fit the space above the hallway archway which is also on an angle so will limit the space available even more so i've narrowed it down to these two units in the subject line. 

 

Daikin looks to be more efficient according to the energywise website so I might go down that route. 

 

Timmmay you're correct about heatpumps in the rooms, I'm not a fan of them myself as they take up space inside and outside of the house and can be annoying from a sound perspective especially with 3 sleeping milk monsters under 2 years old surprised


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  Reply # 2049978 5-Jul-2018 16:54
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Daikin R-series is R32. 

 

 

 

Mitsi has an EER/COP of  3.38/3.63; Daikin is 3.83/3.83. Both are pretty poor; they've run out of space in the indoor to fit more coil. E.g. the Daikin 50RVMZ is EER/COP 4.39/4.55.

 

 


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  Reply # 2050008 5-Jul-2018 17:54
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timmmay:

 

I would find a heat pump in a bedroom too noisy, even on the quietest mode - at least for the large units we have.

 

We have a big heat pump in the lounge which heats the bedrooms from 3pm until people go to bed, from them small oil heaters are silent and effective. In my older but well insulated house we use about 1khw per hour to heat two bedrooms up to around 22 / 23 degrees for 8 hours, 8kwh = about $1.60 per night, or assuming six months a year that's $288. That includes all the other things in the house, fridge and underfloor heating in the bathroom and everything else on standby, no water heating / washing / drying / dishwasher. Two heat pumps would cost about $4000 installed (maybe more) and cut that bill to $0.50 per night. Saving $1.10 per night you take about 3500 days to pay back, 10 years. You do get the advantage of air conditioning as well though.

 

 

 

 

It is not just noise, but the draft they can create. They maybe okay though for very a large bedroom in the right place. 

 

 

 

Other advantages are easier to manage, and also remote heating up if you use the app. Possibly also faster heating.

 

 

 

The thing is it is very difficult to get information. Even talking to installers and going through plans, they have their own opinion on the best way to do it, and can even end up specing totally different powered models from one another using the same brand.


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  Reply # 2050065 5-Jul-2018 20:11
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We have a Diakin 'Cora' FTXM50QVMA in our living room

 

These appear to now be called FTMXxxRVNZ? (not sure why)

 

No issues or regrets getting it, get the WiFi so you can turn on from your phone in bed!

 

 

 

 

 

 


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  Reply # 2050075 5-Jul-2018 20:26
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xlinknz:

 

We have a Diakin 'Cora' FTXM50QVMA in our living room

 

These appear to now be called FTMXxxRVNZ? (not sure why)

 

No issues or regrets getting it, get the WiFi so you can turn on from your phone in bed!

 

 

 

 

RVMZ is an upgraded version/next generation. I don't know what they changed.

 

 

 

They're pretty much in alphabetical order. KVMA, LVMA, skip a few, PVMA, QVMA, and now RVMZ have all been used, and probably many before that.


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  Reply # 2050110 5-Jul-2018 20:48
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SomeoneSomewhere:

xlinknz:


We have a Diakin 'Cora' FTXM50QVMA in our living room


These appear to now be called FTMXxxRVNZ? (not sure why)


No issues or regrets getting it, get the WiFi so you can turn on from your phone in bed!



 


RVMZ is an upgraded version/next generation. I don't know what they changed.


 


They're pretty much in alphabetical order. KVMA, LVMA, skip a few, PVMA, QVMA, and now RVMZ have all been used, and probably many before that.



The R series Cora has been tweaked a little. Better heating capacity and COP. The Daikin rep told me it was designed for NZ heating market which they can do now that they have separated from Australia and dont have to sell the same gear.

As for choosing between the Daikin or Mitsi heat pump, I’d go for the cheaper of the two. R410a will be available for years as there is not yet a good alternative in larger systems. The only time you’ll notice is if you ever have a refrigerant leak and need to pay for r410a which is a more expensive due to the higher ETS levy.

My caveat for putting a heat pump in a hallway is that they can short circuit and reduce their capacity (not work at full heating capacity) as they think the hallway is at temperature. Heat pumps are intended to heat the room they are in, not the room next door.

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  Reply # 2050115 5-Jul-2018 20:57
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I have a 17 years old 8kw fujitsu floor model in the hallway that heats up 4 bed rooms with no problems at all when outside temp. is > 2c(since it is still using R22 and heat model only works > 0c).

 

There will be another 8kw fujitsu installed tomorrow for the living room + kitchen so the days of stacking/chopping wood is finally over. I bought it in NL last month and waited 4 weeks to install it.

 

I was struggling choosing brands and wondering which one is the best but after comparing all the specifications and prices, the latest model of every brand doesn't have much difference in efficiency(They all use R32 and COP difference 3.6x to 3.9x which only a few dollars difference in a year), so only the price + warranty length matters. At the end I actually really want to get a GREE(with built in wifi, 6 years warranty) since they are $1k cheaper than daikin(no model has built in wifi, 5 years warranty) and I do believe GREE's quality since almost every appliances in my house is made in China anyway. But the GREE partner in Dunedin is not really nice I've called them 4 times and got 4 promised callback but never happened. So the next choice is fujitsu(with built in wifi, 6 years warranty) which is $600 cheaper than daikin(no model has built in wifi, 5 years warranty).

 

If you are not that brand targeted you might can just walk in NL and ask for a fujitsu, the are not on sale now, but I talked them to offer me 23% off their retail price and NL is selling wifi version cheaper than non-wifi version, not sure why...


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  Reply # 2050118 5-Jul-2018 21:01
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Kickinbac:
SomeoneSomewhere:

 

xlinknz:

 

We have a Diakin 'Cora' FTXM50QVMA in our living room

 

These appear to now be called FTMXxxRVNZ? (not sure why)

 

No issues or regrets getting it, get the WiFi so you can turn on from your phone in bed!

 

 

RVMZ is an upgraded version/next generation. I don't know what they changed.

 

They're pretty much in alphabetical order. KVMA, LVMA, skip a few, PVMA, QVMA, and now RVMZ have all been used, and probably many before that.

 



The R series Cora has been tweaked a little. Better heating capacity and COP. The Daikin rep told me it was designed for NZ heating market which they can do now that they have separated from Australia and dont have to sell the same gear.
.

 

SomeoneSomewhere:

 

Daikin R-series is R32. 

 

Mitsi has an EER/COP of  3.38/3.63; Daikin is 3.83/3.83. Both are pretty poor; they've run out of space in the indoor to fit more coil. E.g. the Daikin 50RVMZ is EER/COP 4.39/4.55.

 

 

My FTXM50QVMA has a EER/COP of 4.39/4.51 (& 4 energy stars for heating) - seems at least for the EER/COP specs negligible difference on the newer model

 

 

 

 

 

 




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Wannabe Geek


  Reply # 2050213 5-Jul-2018 23:32
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Great info thanks everyone. The wifi option sounds like it's worth looking into also!


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  Reply # 2064733 30-Jul-2018 04:47
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Don't worry too much about R410a versus R32. What matters is efficiency and although R32 can increase efficiency it doesn't automatically make a unit efficient. The Daikin Cora R32 units are usually more efficient than other brands' R32 units.

 

 

The specific FTXM46RVMZ you wrote of is not particularly efficient. A heat pump must combine external and internal units and that one combines the smaller internal unit with the larger external unit. I'd go a size larger or smaller. Look at the specs on their website.



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Wannabe Geek


  Reply # 2064783 30-Jul-2018 09:05
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I've gone for the Mitsubishi GL series heatpump as it was a great fit into the space we had available in the archway, R32, reasonable efficiency on the GL35. Running the system throughout the day on 16 - 18 degrees and ramping it up at night as required is doing a great job of keeping the chill out of the air on these frosty canterbury mornings/winter days and heats the bedrooms.


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  Reply # 2094607 21-Sep-2018 15:22
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Turbinefromhell:

 

I've gone for the Mitsubishi GL series heatpump as it was a great fit into the space we had available in the archway, R32, reasonable efficiency on the GL35. Running the system throughout the day on 16 - 18 degrees and ramping it up at night as required is doing a great job of keeping the chill out of the air on these frosty canterbury mornings/winter days and heats the bedrooms.

 

 

Did they charge extra for the WiFi? I've collecting heatpump quotes at the moment and the ones I have so far say $250 extra per unit for WiFi. Given we're installing three units, an extra $750 is a big chunk of cash. Is WiFi worth paying close to 10% extra for?




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Wannabe Geek


  Reply # 2094619 21-Sep-2018 15:41
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Hey bud, yea it was an extra charge for wifi which you can retrofit after installation I opted to go without and to be honest it’s no issue for us not having it.

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