Espar Air Heaters do not provide engine heat but are quicker to recuperate heat lost during service stops. School Bus Heater Applications Hydronic 10 provides preheat and supplement heat for small to large buses. D12W provides a quicker preheat in extreme cold climates.
Sizing is dependent upon customer specifications, size of bus and operating climate.
Hydronic 10 meets the requirements for both engine preheat and supplemental heat. D3LC compact provides significant supplemental heat for 26 passenger buses or smaller. D5LC should be considered for larger buses or severe cold climates.