Mitsubishi Ecodan 11.2kW vs Vaillant aroTherm Plus 10kW vs with/without Mixergy tank
Hello all, we are considering quotes from our installers for the above ASHPs, with or without a 250l Mixergy tank. I am generally of the impression that the Vaillant pump is better, but it is about £1200 more than the Mitsubishi without the cost of building its own little platform and soakaway in the garden (which I have yet to get a quote for).
Would be most grateful to hear people's views / experiences on:
- The relative merits of Mitsubishi Ecodan vs Vaillant aroTherm - which would you guys choose, taking account of the price differential?
- I assume the mixergy would definitely be a good add on for the Ecodan, but I haven't seen anyone talk about it in combination with the aroTherm - any thoughts on this combo?
Thanks in advance.
I'm no expert so you'll have to wait for one of the other regular contributors to come along and opine on relative merits of the two manufacturers. However, I have just two points....
Firstly, we have a Mitsi (the 8.5kW) and have had no reason at all to fault it. We were originally spec'd with a Vaillant but supply problems meant our installer offered the Mitsi given they had some in stock already, and it's been rock solid so far.
Secondly, both our experience and a recurring theme being bandied about all the time on this forum and elsewhere is that the differences between the different manufacturers' units are in practical terms trivial if you can get an installer who knows what they are doing with the system design and installation. I'm struggling to think of any thread on this forum outlining a nightmare centred around the failings of the unit itself rather than of the design or installation of the overall system.
105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs
"Semper in excretia; sumus solum profundum variat"
@majordennisbloodnok many thanks, good to know you've had a good experience with the Mitsubishi pump. I assume you don't have the Mixergy cylinder?
The design is more important than the unit, unless you want to take advantage of the manufacturers specific controls as opposed to a simple on/off stat or the homely smart stat.
if you want to get the benefits of the homely smart stat then you’d be looking for a unit that homely have done the modbus integration for in which case you’re looking at Samsung or Midea.
Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.
My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.
Posted by: @kk_777@hughf I must confess I have no idea what a "homely stat" is. Also, I am a bit limited to the ASHPs that my installer works with, and they strongly prefer Vaillant and Mitsubishi units.
Homely is a smart thermostat that is specifically designed for ASHP use. It provides full, advanced, weather comp and scheduling from a smart phone app. It automatically sets the weather comp curves up to suit your property location and rad emitter sizing. It's a complete game changer:
But if you are stuck with what your installer will fit then go Vaillant - but make sure it's a complete Vaillant package with all their controls, wiring center and thermostat. You'll get sub-standard performance installing a Vaillant without using their balance-of-system components.
Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.
My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.
Posted by: @kk_777Hello all, we are considering quotes from our installers for the above ASHPs, with or without a 250l Mixergy tank. I am generally of the impression that the Vaillant pump is better, but it is about £1200 more than the Mitsubishi without the cost of building its own little platform and soakaway in the garden (which I have yet to get a quote for).
Would be most grateful to hear people's views / experiences on:
- The relative merits of Mitsubishi Ecodan vs Vaillant aroTherm - which would you guys choose, taking account of the price differential?
- I assume the mixergy would definitely be a good add on for the Ecodan, but I haven't seen anyone talk about it in combination with the aroTherm - any thoughts on this combo?
Thanks in advance.
We too have a Mitsubish ASHP and it's been great - good performance and reliability and lots of engineers who know them. I can't comment on Vaillant, nor do I have a Mixergy tank.
I cannot comment on the relative pros and cons but can tell you I have a Mitsubishi 11.2 ASHP and I’m very pleased with it. My only comment re the Mitsubishi is, if you go that route, to insist that your installer use only Mitsubishi controls. Mine installed third party wifi stat’ which although it worked it caused confusion. Third party parts were used due to shortage of supplies, allegedly. Once changed the system works flawlessly. Very impressed. I cannot comment on the Mixergy but remember somebody on this site recommending it to me when I was setting out on my ASHP journey. My installer decided against. I think some installers are set in their ways re makes and models due to familiarity. If you get a good install I doubt you’ll regret it. Good luck.
Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.
2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.
Always go with the manufacturers controls/stats (if you must have a stat - ideally you don't need one)
Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.
My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.
-
Rodents! A word of warning for heat pump owners
4 days ago
-
Surface mount or bury primaries for heat pump installation?
2 months ago
-
UFH and ASHPs
3 months ago
-
Installing your own ASHP - DIY
4 months ago
-
ASHP install contract and BUS grant money
6 months ago
Currently viewing this topic 2 guests.
- 26 Forums
- 2,151 Topics
- 47.2 K Posts
- 35 Online
- 5,666 Members
Podcast Picks
Latest Posts
-
RE: Midea ASHP – how to set weather compensation
I think this is very unlikely indeed. If the water is ...
By JamesPa , 2 minutes ago
-
RE: Help me keep the faith with my air source heat pump installation
@adamk, interesting point. I’ve not focused much on Hea...
By Mars , 40 minutes ago
-
RE: is a home battery without an EV worth it?
@jamespa having just had a heat pump installed I do won...
By AdamK , 10 hours ago
-
Intelligent Octopus Flux (IOF) Review
I promised @toodles that I would provide an update and ...
By Old_Scientist , 13 hours ago
-
RE: Electricity price predictions
Seems a lease to a 3rd party to place a battery inside ...
By Scalextrix , 14 hours ago
-
RE: Octopus tariffs - a quick comparison
Interesting comparison! Another good angle is the dif...
By HCas , 15 hours ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@julianc Our solar PV has produced more this August tha...
By Toodles , 22 hours ago
-
RE: Who's your electricity provider and what's your tariff?
I am pleased to see the change. We definitely need t...
By Jeff , 2 days ago
-
RE: A Customer's Lessons Learnt from a Heat Pump Installation in a Large House
@jamespa Crossing sheep with kangaroos?
By Toodles , 2 days ago
-
RE: How Do I Know When the Hot Water Has Run Out?
@transparent that is a very interesting suggestion, tha...
By GrahamF , 3 days ago
-
RE: The good, the bad and the not that great – my heat pump installation
Sorry to resurrect this thread, but it is sort of relev...
By cathodeRay , 3 days ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
I missed your 22nd June post on this. I am sure it can ...
By cathodeRay , 3 days ago
-
Now posting on the right topic.... With general build...
By benson , 3 days ago
-
RE: How to waste energy (and time) playing with AI.
I’m sure like many software toys that it is addictive! ...
By Judith , 3 days ago
-
RE: Does anyone have experience of a smart water meter?
@judith With Anglia Water it was a compulsory upgr...
By TechnoGeek , 4 days ago
-
RE: Balancing financial efficiency and comfort using the Octopus Cosy tariff
We’re high energy users other than the ashp so the OVO ...
By Judith , 4 days ago
-
RE: What crazy nonsense are inverter limits and why are they imposed?
No I'm not mining anything @drei but I am doing R&...
By Transparent , 4 days ago
-
RE: Rodents! A word of warning for heat pump owners
Wasps caused frequent tripping of my lighting circuit a...
By JamesPa , 4 days ago
-
RE: Ecodan & MelCloud scheduling
Yes, the 2 are separate. To add to the complex desig...
By HCas , 6 days ago
-
I should clarify that the FoxESS web interface is not l...
By Old_Scientist , 6 days ago