Am I doing the right thing before I give the go ahead:

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Hello guys, just looking for a little support on this matter. As you know my system is being replaced and I have been given two different quotes, Multi Split or separate systems. Am I doing the right thing going for the separate systems? I know I can use the auto change over function and have diff rooms in heating/cooling on separates if required.

Equipment suggestions as follows; This is for Mitsi M Series: Separates works out cheaper than Multi.

Separate Splits:

2 X SUZ-KA35VA (OUTDOOR UNITS 3.5KW)
2 X MFZ-KA35VA (INDOOR FLOOR MOUNTED UNITS 3.5KW)

1 X MUZ-FD35VAH (OUTDOOR UNIT 3.5KW)
1 X MSZ-FD35VA (HIGH COP INVERTER WALL MOUNTED UNIT 3.5KW)


Multi Split:

1 X MXZ-4A80VA (OUTDOOR UNIT 8KW)

2 X MFZ-KA35VA (FLOOR MOUNTED UNITS 3.5KW)

1 X MSZ-FD35VA (DELUXE WALL MOUNTED UNIT 3.5KW)




Worried about Maintenance costs also, for instance if compressors go after the warranty on two systems then I assume its more expensive than just fixing a multisplit unit


Been given running specs so I can see just how much each system should use and what the multi would use: Seems cheaper to run one split system rather than the multi if I only want one indoor unit operating. However uses more wattage if all three are running flat out wheareas multi comes in less if all 3 are running.

Separate splits: Can ramp down more thus producing even less capacity if need be.


Capacity - Cooling (min. - max.): 0.9 - 3.9 kW
·
Capacity - Heating (min. - max.): 0.9 - 6.2 kW
·
Power input - Cooling (min. - max.): 0.19 - 1.25 kW
·
Power input - Heating : 0.19 - 2.24 kW


Multisplit: Specs for 1,2 & 3 unit operation: To have one unit operating uses more than if one was operating.


1. Capacity - Cooling (min. - max.): 3.5 (1.5 - 4.3)
·
Capacity - Heating (min. - max.): 4.0 (1.2 - 4.8)
·
Power input - Cooling (min. - max.): 1.030 (0.400 - 1.290)
·
Power input - Heating : 1.210 (0.330 - 1.570)

2. Capacity - Cooling (min. - max.): 7.0 (2.0 - 7.1)
·
Capacity - Heating (min. - max.): 8.0 (1.8 - 9.8)
·
Power input - Cooling (min. - max.): (0.540 - 2.550)
·
Power input - Heating : 2.370 (0.480 - 3.230)


3. Capacity - Cooling (min. - max.): 7.95 (2.9 - 9.0)
·
Capacity - Heating (min. - max.): 9.4 (2.6 - 11.6)
Power input - Cooling (min. - max.): 2.280 (0.720 - 2.910)
·
Power input - Heating : 2.170 (0.530 - 3.380)


If you dont mind, what is your opinions on all of the above. Aesthetics are not a problem etc. I am spending a lot more this time than the LG and want to make sure the overall solution is perfect.

Installer reckons multisplit but this comes out at £450 more than separate splits, he says over the long run it will work out cheaper for me???? Confused.com now!