Eberspacher Question

[Talulah]

My old Eberspacher has 90mm diameter ducting. This is no longer readily available. The new Eberspacer kits come with 75mm ducting. Is it ok to downsize the ducting or should I buy 100mm ducting instead. Not easy to increas a 90mm hole to 100mm. Further, is it worth lagging the ducting or is only a small amount of heat lost through the ducting in relation to the total heat output?

 

[boatmike]

What size eber is it?

 

[Talbot]

The decision to lag the pipework can only be made when you consider the length of the pipe, and where it is sited in the boat. My pipework is relatively short (abt 5 metres total and 5 outlets) and is all under the saloon seating. Thus it provides a nice warm seat! If you have a very long pipework, or the heat being disipated through the pipe is being wasted, then fit lagging (good stuff available for already installed systems made from thinsulate). The difficulty in increasing the holes from 90 to 105mm will surely depend on the material that needs to be modified. I would have thought that this would have been relatively easy using a jigsaw and finishing with a flap wheel sander unles you are trying to go throuh a really thick bulkhead.

 

[Gordonmc]

I bought non-Eberspacher ducting from Flexible Ducting of Milngavie, Glasgow. It is a wire-spiral reinforced composite material which is less crushable than the ali stuff and is available in any length (within reason).
It may be they will have 90mm. www.flexibleducting.co.uk.
I only lagged in areas where the heat would be wasted, ie. through the engine comartment. Where it goes through lockers and under bunks I left it, reasoning that the warmth would do some good.

Best of luck with it.

 

[cliff]

Do NOT reduce the duct size - Doing so will reduce the airflow and could lead to the heater overheating and cutting out (from bitter experience)
I insulated the ducting on mine for the full length of the duct as i see no benefit in heating the aft locker nor the engine bay although there is still a little heat loss it is negligible and the air temp coming into the cabin is still over 100°C at the outlet - great for drying soggy deck shoes etc.
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[PaulR]

read a review about lagging which persuaded me that worth doing-thinsulate special product sounds great but ow,,, costly-was told to use insulation for domestic hot water cylinders from DIY store - did so - easy to fit - looks neat (plastic wrapped fibreglass) and our theory is we would rather the heat came out of the pipes onto us than wasted in warming up locker and contents