I gave someone advice while installing one of these, it circulates water by convection only, the Iboost was directed to this only, only problem was that the (integral) thermostat had to be set quite high and a pipestat also used, while its working pretty well, I feel it wouldnt be the way to go here and keep this setup as simple as possible.
The problem/challenge with Iboost is that its intermittent so so some level of heat must be maintained in the cylinder, one could just use the oil/gas coil (with ~ 30% of elec heating cost) to maintain the cylinder at 40C (boost it once/week to 60C for legionella protection) and just power the immersion with Iboost only, this should work well in the winter but in the summer with high solar panel output then perhaps all electric only with a destrat pump?. when using coil heating then its impossible to install a electric heating element below the top coil as it would foul the coil, easy if no heating coil as two elements are then frequently installed, the bottom one for nightrate elect heating at night, the other for boosting by day.
The problem/challenge with Iboost is that its intermittent so so some level of heat must be maintained in the cylinder, one could just use the oil/gas coil (with ~ 30% of elec heating cost) to maintain the cylinder at 40C (boost it once/week to 60C for legionella protection) and just power the immersion with Iboost only, this should work well in the winter but in the summer with high solar panel output then perhaps all electric only with a destrat pump?. when using coil heating then its impossible to install a electric heating element below the top coil as it would foul the coil, easy if no heating coil as two elements are then frequently installed, the bottom one for nightrate elect heating at night, the other for boosting by day.
