I've had Evohome for about 12 months now on my Y-plan vented system (heating and water controls). It works ok most of the time but I do get some phantom switching on of the heating shortly after the heating program has finished - I've put this down to the heating BRD91 having not great reception which I will fix with this project.
What I'm doing (with the aid of a couple of plumbing friends) is moving to a Megaflo unvented cylinder system, and moving the cylinder to the loft whilst I'm at it, allowing a bigger bathroom. We start work tomorrow.
I upgraded the Evohome system myself, being reasonably ok with electrics and will be doing the electrics on the new system. But things are a little more complicated as the Megaflo cylinder comes with its own 2-port valve for the HW control, and the manufacturer wants installers to use the Megaflo's water thermostat with the HW 2-port valve, this is a safety requirement (to stop the cylinder overheating) - this all seems sensible. But, this creates a problem for my Evohome installation in two ways: 1) Evohome wiring likes to control the HW itself; 2) I can't see anywhere to fit the Evohome HW thermostat on the Megaflo cylinder. I've spoken to Megaflo who confirm there is not an auxiliary pocket to fit a 2nd thermostat. Their recommendation was to fix the sensor to the HW outlet at the top of the cylinder.
So I thought I'd ask the forum if they have any ideas (I have done some searching but couldn't find any definitive guidance, and I don't really want to drill a hole in the outerskin of my nice new water tank)! I get that the Megaflo sensor should be fine for controlling the internal water temperature, but I like seeing what temperature the water is in Evohome. Also, I want to use Evohome as the programmer to control when HW turns on / off (I don't want it on all the time)! Can I use the HW BRD91 without a HW sensor attached and have it acting just as a programmer? And one last point of complexity, I have pv solar running off a solar switch (that diverts spare electricity to the immersion) - I don't see this as a problem as the solar switch is on the immersion supply.
Can anyone offer any words of wisdom on how best to control HW with the new system?
Thanks - Adrian
What I'm doing (with the aid of a couple of plumbing friends) is moving to a Megaflo unvented cylinder system, and moving the cylinder to the loft whilst I'm at it, allowing a bigger bathroom. We start work tomorrow.
I upgraded the Evohome system myself, being reasonably ok with electrics and will be doing the electrics on the new system. But things are a little more complicated as the Megaflo cylinder comes with its own 2-port valve for the HW control, and the manufacturer wants installers to use the Megaflo's water thermostat with the HW 2-port valve, this is a safety requirement (to stop the cylinder overheating) - this all seems sensible. But, this creates a problem for my Evohome installation in two ways: 1) Evohome wiring likes to control the HW itself; 2) I can't see anywhere to fit the Evohome HW thermostat on the Megaflo cylinder. I've spoken to Megaflo who confirm there is not an auxiliary pocket to fit a 2nd thermostat. Their recommendation was to fix the sensor to the HW outlet at the top of the cylinder.
So I thought I'd ask the forum if they have any ideas (I have done some searching but couldn't find any definitive guidance, and I don't really want to drill a hole in the outerskin of my nice new water tank)! I get that the Megaflo sensor should be fine for controlling the internal water temperature, but I like seeing what temperature the water is in Evohome. Also, I want to use Evohome as the programmer to control when HW turns on / off (I don't want it on all the time)! Can I use the HW BRD91 without a HW sensor attached and have it acting just as a programmer? And one last point of complexity, I have pv solar running off a solar switch (that diverts spare electricity to the immersion) - I don't see this as a problem as the solar switch is on the immersion supply.
Can anyone offer any words of wisdom on how best to control HW with the new system?
Thanks - Adrian
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