This is a question that many of us face from
time to time, and the answer is often not very straightforward. It depends on a number of factors: can it be
fixed; what’s the cost of repair versus replacement; can we live on with the
fault. We have just been through this
decision making process with our Eberspacher diesel boat heater. Why do things break down when you need them
most?
The last couple of weeks have been cold and
damp and waking up in the morning with ice on the INSIDE of the cabin windows
is no fun. Readers will be aware that we
are trying to live as ‘green’ as possible, so we already faced the dilemma of whether
to use our diesel heater for short periods to take the chill out of the boat. In the scheme of things the environmental
impact of our heater is fairly insignificant.
We keep the usage down to a minimum and put extra jumpers on to keep
warm. However, the heater started to run
rough and was making a dull thumping sound.
Some research on the internet suggested that, at the very least, a
service was needed, but there could be other problems lurking in there.
The heater we have fitted is an Eberspacher
D5 Airtronic unit. It retails at around
£2500 - £3000, which is a significant amount of money. Even some of the spare parts can set you back
around £500 a shot. A service kit alone
costs about £80-£90. Then I got chatting
with someone along the pontoon and he had just replaced his old Eberspacher
unit with a Chinese copy and he suggested I should do the same. When I looked at the price of the copy
version I realised that you could get a complete system for less than 10% of
the genuine Eberspacher unit.
So here’s the dilemma. Fix or replace? Firstly, there is clearly some reason why the
Chinese one is so cheap. I believe that
you often get what you pay for. The
quality of the copy heaters is nowhere near as good as the genuine
article. They also do not have a
long-standing history of reliability.
Remember, these heaters are burning diesel fuel under controlled
conditions. But what happens if the
controls don’t work? I would not be
happy risking a fire aboard. Okay, so
the Eberspacher one may not be ten times better, but it is certainly much
better. I also think they will last much
longer in the marine environment than a cheap import. Secondly, under what working conditions has
the Chinese one been manufactured? If something
seems too good to be true, it usually is.
Finally, although our heater was installed about ten years ago it has hardly
been used much and looked, at least from the outside, to be in good condition. So with these considerations in mind I decided
to try and fix our heater and ordered a service kit.
Thankfully removing our heater was fairly easy. It is located in the engine room with plenty of space around it, so disconnecting the pipes, hoses and wiring was straightforward. Nothing broke!
I then removed the glow plug and looked at
the condition of the glow plug screen.
It was completely blocked up with carbon deposits and was stuck inside
the casing. Some persuasion with
long-nosed pliers and screwdrivers was needed to remove the old screen. The photographs below show the extent to
which the screen was blocked.
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Having removed the screen I then dismantled the unit as far as I could in order to remove as much carbon build-up as I could. The extent to which this model of heater can be dismantled is limited. You cannot open the combustion chamber which is disappointing so I hope I have cleaned it sufficiently for it to work.
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Once I had cleaned it as much as I could it
was then reassembled and reconnected. So
far so good. The heater fired up and ran
happily for about 30 minutes, so fingers crossed it will work fine in the
morning if it’s needed.