Andrew Bissell - Sunamp

I hope its okay to make couple of comments on this thread without it being seen as commercial. @readiescards I am sorry you and your tenants had a frustrating experience with hot water failure. You were a week out of warranty on the controller which could have been doubly infuriating. So when you spoke with Neale from our team, he sensibly offered you a free replacement relay as a goodwill gesture. You specifically requested the ‘most up to date’ relay - so we sent the spade-terminal relay as this is the one used in the current B100 controller. I appreciate this differed from the one in your box which fits on a DIN rail. (Note: There has never been a safety-related recall campaign - we did upgrade to make the product somewhat quieter in operation.) Feel free to contact us directly and we will swap it for a DIN-rail part. From Sunamp’s CTO, Sandy Gataora (with my emphasis added in italics) on Solid state relays (SSR): For these reasons we do not use SSR. It is nothing to do with cost and everything to do with safety. (Do note that if we had a penny-pinching approach I would never have specified Vacuum Insulation Panel to get an A+ low heat loss ... I would have just used PUR and got a B, C or D like a hot water cylinder. I wanted Sunamp to do better.) On ‘arcing’ this is completely normal for relays or contactors of any kind. On all the other safety related notes in this thread we use the same safety-first design philosophy. Hence relays not SSR; hence overheat stat as a last line of defence if relays or controllers fail in an ON state. Finally we have independent test lab validation of the safety choices we have made. @readiescards do feel free to contact us directly if you have any residual concerns.