Better check first your water pressure if youre planning to install those pressure activated heaters.. I tried Champ and its useless for low pressure(pressure switch wont engage), i ended up trimming the spring w/c automatically voided the warrentey. Didnt experience any problems with my 15yo Stiebel Eltron orig Germany, daily use never missed heating my shower even at low pressure. Multipoint model is very sturdy too since this is what i got at home. I dunno how good the newer Indonesian or Thai made? Handyman carries this brand and some hardware at T.Alonzo.
These heaters are generally safe if you wire it correctly and periodically inspect wires for chaffing, enclosure for cracks.. Ingress Protection is standard for these kinds of industrial and home heating devices.
panasonic din yun mulitpoint ko. free installation naman before....hinde ko na maalala yun price...sa mga guest rooms single point na joven...sobrang mura wala pang 2k