Eberspacher 4KW. Silencer required?

[stuhaynes]

My mate Ian has just bought a new {looking} Eberspacher 4D. It was supposed to be complete, but although it has a flexy exhaust pipe about a foot long, there is no silencer. I have looked on line at the Eber manual and it does mention a silencer as an option(tional extra?).

The heater in question will be running all over the coming winter (in the marina) and I wondered whether the noise level without the silencer would be acceptable to other boaters? If it does require a silencer who would be the cheapest supplier?

We're going to fit it on Saturday so some advice about the silencer (and the install come to that) would be very welcome.

 

[pvb]

If it's going to be used a lot in a marina, it wouldn't be a bad idea to fit an exhaust silencer, which is about £40-50. As for installation, follow the guidance in Eberspacher's Marine Installation Guide.

I'd also thoroughly recommend fitting a process air silencer to the main outlet ducting; this will make the heater almost inaudible in the boat.

 

[pcatterall]

Yes he should fit one. As it will be inside he should pay special attention to the joints.
A silencer on the combustion air intake may be worthwhile ( he can try it without first) And ( on the noise subject) mount the pump via a rubber mounting as the 'click' can be quite obtrusive.

 

[clyst]

Be careful when buying a silencer . The cheapy ones are for road use and are not suitable for marine use . Exhaust integrity is a problem with them .

 

[rob2]

Just a caution about exhaust silencers. The readily available ones of pressed steel are designed for mounting beneath a road vehicle and are reputed to leak so would be hazardous in their typical location in a locker (which probably isn't gas tight from the bilges!). There is another type for marine applications, which I haven't actually seen, but the blurry image in the manuals is of a concentric cylindrical construction.

Rob.

 

[Pagetslady]

Just a caution about exhaust silencers. The readily available ones of pressed steel are designed for mounting beneath a road vehicle and are reputed to leak so would be hazardous in their typical location in a locker (which probably isn't gas tight from the bilges!). There is another type for marine applications, which I haven't actually seen, but the blurry image in the manuals is of a concentric cylindrical construction.

Rob.

The cheap ones do leak I found out the hard way, I have now modified the one I did install in the locker and found it leaked, I use it when in close proximity to other boats by sticking it via a short length of flex exhaust into the out side of the exhaust skin fitting this works fine, but the D4 when running hard is very very noisy good luck with the installation.
Mike

 

[CaptainBob]

Why use an eber in a marina? Electricity cheaper and silent.

 

[David2452]

Just a caution about exhaust silencers. The readily available ones of pressed steel are designed for mounting beneath a road vehicle and are reputed to leak so would be hazardous in their typical location in a locker (which probably isn't gas tight from the bilges!). There is another type for marine applications, which I haven't actually seen, but the blurry image in the manuals is of a concentric cylindrical construction.

Rob.

Proper marine silencers (for air heaters anyway) should be, and mostly are be manufactured as an integral part of the exhaust tube, they are not overly expensive even at retail and really shut the noise down, the link shows a perfect example.

http://www.mikuniheating.com/Details.cfm?ProdID=106

 

[stuhaynes]

Why use an eber in a marina? Electricity cheaper and silent.

Not an option. On our marina there is only either 6 amps or (fewer) 10 amp connections. My mate is on a 6 amp supply so very restricted

 

[lynall]

Intake silencer makes a big difference, e bay webasto thermotop, im sure eber do one as well.


Lynall

 

[Otter]

Not an option. On our marina there is only either 6 amps or (fewer) 10 amp connections. My mate is on a 6 amp supply so very restricted

Agreed, that's only 1.4kw, his eber will produce 4kw and leave the marina leccy to charge the battery and run lights. And I'm not sure that the eber wouldn't be cheaper. 4kw of leccy is 80p per hour which is just under 1l of red diesel at the heating rate of duty; no way the eber is going to use 1l per hour surely???

 

[David2452]

4kw of leccy is 80p per hour which is just under 1l of red diesel at the heating rate of duty; no way the eber is going to use 1l per hour surely???

About half that even at full chat, don't forget the electrical heater will most likely be kicking in and out on the thermostat though so not a constant draw.