For our coach air heater, we have an unusual Westfalia specific Espar D4S and not a regular Espar D4.
From Wasaabi and others, we know we have a Westfalia specific circuit board in the heater which can communicate with the windshield central computer console. From OneManVan, we know that not all Espar controllers are compatible with our heater.
The "S" version of the D4 allows for longer and narrower ductwork.
Released in 2019, Espar has replaced the D4S and D4 Plus models with a new M2 D4R (recreational model) (the standard D4 model has also been superseded by M2 D4L???).
https://www.heatso.com/espar-eberspacher-airtronic-d4r-recreational-12v-4kw-heater-kit/?aff=6
The nomenclature is a bit unclear with a "M2" label in the model name which would seem to suggest a marine application.
From the description of the new heater, the service life is now 5,000 hours versus the previous 3,000 hours. Noise level is also reduced. High altitude adjustment is automatic.
Note: There may be some good sales on the superseded D4S model. One might use our original Westfalia circuit board in a replacement D4S if the circuit board is good.
There is also a replacement for the smaller D2 Airtonic model, the S2 D2L model. Don't know of any Westy owners who have replaced their original heater with a smaller heater.
https://sprinter-source.com/forum/showthread.php?t=75153
From Wasaabi and others, we know we have a Westfalia specific circuit board in the heater which can communicate with the windshield central computer console. From OneManVan, we know that not all Espar controllers are compatible with our heater.
The "S" version of the D4 allows for longer and narrower ductwork.
Released in 2019, Espar has replaced the D4S and D4 Plus models with a new M2 D4R (recreational model) (the standard D4 model has also been superseded by M2 D4L???).
https://www.heatso.com/espar-eberspacher-airtronic-d4r-recreational-12v-4kw-heater-kit/?aff=6
The nomenclature is a bit unclear with a "M2" label in the model name which would seem to suggest a marine application.
From the description of the new heater, the service life is now 5,000 hours versus the previous 3,000 hours. Noise level is also reduced. High altitude adjustment is automatic.
Note: There may be some good sales on the superseded D4S model. One might use our original Westfalia circuit board in a replacement D4S if the circuit board is good.
There is also a replacement for the smaller D2 Airtonic model, the S2 D2L model. Don't know of any Westy owners who have replaced their original heater with a smaller heater.
https://sprinter-source.com/forum/showthread.php?t=75153
Last edited by a moderator: