We would recommend the ULSA-2 050 as a replacement for your Reznor ECOO 5050B. Please click the link below to view the product. https://www.reznor.co.uk/product/rheco-warm-air-heaters/?selected=3963&pa_kw=2467&pa_fuel-type=2429&pa_range-type=2469
What would be a good replacement for a Reznor ECOO 5050B?
Looking to upgrade your old heater? Look here for information on which product is the best like-for-like replacement.