Upping the Alde
QWhen the Alde 2928 central heating boiler on my boat is switched on, the water ‘sloshes’ around the system until it comes to temperature and then runs relatively silently. Is there an equivalent to the expansion tank on domestic central heating systems? I can see no way of topping up or inspecting the level. Assuming it wants topping up, what does one put in? JULIAN NEWTON-TYERS, via email
ATONY REPLIES: The Alde has two long metal covers, one above and one below the control panel. Push the top one up until you can lift it clear of the lip at the top of the control panel and then pull it down. You will see the header tank at the top with the circulating pump motor sticking out of the lid.
With the pump switched off, unscrew the pump retaining cap/ring and carefully lift the pump out of the tank. Fill it no more than quarter full (when cold) with 50% antifreeze mixture.