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Not enough heat 1. Appliance undersized 2. Thermostat set too low. 3. Incorrect supply pressure. 1. This is especially true when a dwelling or room is enlarged. Have the heat loss calculated and compare to the appliance output (70% of input). Your gas company or installer can supply you with this information. If appliance is undersized, replace with correct size unit. 2. Setting of thermostat. See “Lighting and Shutting Down Instructions”. 3. Check supply pressure as outlined above. Too much hea