I'm planning on converting to Herms.....and planning to buy another kettle to convert into the herms HLT. I have a 10 gallon boil kettle, and a ten gallon MLT....do I get a ten gallon HLT or 15 Gallon ??? To My line of thinking (since I only do 5 to 7 gallon batchs) If I use ( In a ten gallon pot)up to 8 gallons of strike and sparge water, will there be enough left in the HLT to cover the heat exchange coils for recirc heating of the MLT. Or am I missing something?