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What to use where
Older MECS system
REU-MSA2M
REU-MSA2S
REU-MSA3M
REU-MSA3S
Decription
Location
Part number
No. of water heaters
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
1
Refer Infinity model compatibility on next page
Rinnai New Zealand Limited
0800 746 624
MECS
New installs substitute
REU-MSBM
REU-MSBC1
REU-MSBMB
REU-SBC1
Master
Inside Infinity
External box
1
REU-MSBM
REU-MSBMB
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
5
MSB-C1, MSB-C2,
MSB-C3
Replacement spare part
REUMSBM
REUMSBC3
REUMSBMB
REUMSBC1
Slave
2
REU-MSBC1
-
1
2
3
2
3
4
5
6
5
6
7
8
9
8
9
10
11
12
11
12
13
14
15
2
Joiner
REU-MSBC2
-
-
-
-
1
1
1
1
1
2
2
2
2
2
3
3
3
3
3
4
4
4
4
4
2011 MECS: MSB-C1, C2 and C3
01-11
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