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I've just spotted a trace heater on ebay that looks like it's designed specifically for condensing boilers. If you search ebay for 'trace heater' you'll find it.

If you use the cheap crap that comes out of Italy yes, and if the mains pressure is low, you're absolutely right but - if you use genuine GAH kit or similar vessels from Trentclyde Water Solutions (which are slightly cheaper) you can add a Charger pump and legally boost the pressure directly...

You could always fit a GAH Dualstream to keep the flow rate up.

You can legally pump up to 12 litres per minute from the mains. This is only of any use if you pump this into an accumulator and store the water under pressure. There are patented systems available on the market which allow you to do this.