It is a 3A 24V power supply. The knobs come in a 3 pack 7090.102. You can order any spare part on Tunze.com or eBay store TunzeUSA. The eBay store will generally accurately reflect stock in the US, however we just got a shipment this week and need to update the inventory. Tunze.com will reflect inventory at the factory in Germany, so out of stock or in stock may not mean we have it here for immediate shipping. I have 6101.240 power supplies, but we are out of 7090.102 knobs. I expect more knobs in 2 weeks.
It will work fine, we generally try to keep the power supplies smaller both to cut costs and add some safety redundancy, it basically means that if the pump safety didn't shut it down, the power supply safety would at a much lower threshhold. 5 Amp you lose some of that safety margin, but it is unlikely to be an issue.
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