Grow Room & Greenhouse Heaters
Grow room and greenhouse heaters maintain minimum temperature thresholds during cold periods -- protecting crops from cold stress, keeping root zone temperatures above the minimum for healthy growth, and maintaining the environmental stability that climate controllers and VPD management depend on. The heater selection at Hydrobuilder covers King Electric portable and wall-mount electric heaters for small to mid-size grow rooms and greenhouses, Reznor gas-fired unit heaters for large commercial greenhouse heating applications, and specialty heating for specific applications including pump house and utility space frost protection.
King Electric Heaters for Grow Rooms
King Electric produces portable ceramic heaters (PH and PUH series) and wall-mount electric heaters (KTW series) designed for continuous-duty operation in humid environments. The KTW series with recessed grill mounts directly to the wall and delivers 120V or 240V forced-air heating in a compact, moisture-resistant housing -- appropriate for grow tents, small grow rooms, and propagation areas. King Electric pump house heaters in stainless steel are rated for unheated utility areas and provide frost protection for irrigation equipment, pumps, and plumbing in outdoor or uninsulated spaces.
Reznor Commercial Gas Heaters
Reznor produces commercial natural gas and propane unit heaters used in large greenhouse and warehouse growing facilities where electric heating becomes cost-prohibitive at scale. Gas heat provides high BTU output per dollar of operating cost for commercial operations, making Reznor unit heaters the standard choice for heated greenhouse structures above a few thousand square feet. For commercial greenhouse heating projects, call 888-815-9763 or request a quote -- sizing and installation requirements for Reznor units require facility-specific assessment. Browse environment controllers for automated temperature management. Expert support available.
Grow Room Heaters FAQ
What size heater do I need for a grow room or greenhouse?
Calculate the heat loss of your space first: measure the total surface area (walls, ceiling, floor) and multiply by the insulation R-value appropriate for your construction. A rough guideline for a well-insulated grow room: plan for 10-15 BTU per square foot of floor area for each degree F of temperature differential between desired indoor temperature and the coldest expected outdoor/ambient temperature. A 10x10 room (100 sq ft) needing to maintain 70 degrees F when ambient is 40 degrees F (30 degree differential) needs approximately 30,000-45,000 BTU/hour from the heating system -- roughly 9,000-13,000 watts of electric heat. Call 888-815-9763 for commercial greenhouse sizing assistance.
Can I use a standard space heater in a grow room?
A standard household space heater can provide supplemental heat in a small grow room or tent, but they are not designed for the sustained, humid conditions of an active growing environment. Moisture from irrigation, transpiration, and humidifiers can damage household heaters not rated for wet or humid locations, and standard ceramic heaters are not built for the 24/7 duty cycles that grow room heating often requires. King Electric's grow room and pump house heaters are specifically built for humid, continuous-duty applications. For any large-scale heating need, consult a licensed electrician before installing high-wattage electric heating to ensure your panel and wiring can handle the load safely.
Should I use electric or gas heating for a greenhouse?
For small greenhouses (under 1,000 sq ft), electric heating is typically simpler to install and easier to integrate with thermostats and environmental controllers. For large commercial greenhouses (1,000+ sq ft), natural gas or propane unit heaters have significantly lower operating costs per BTU -- natural gas heat costs roughly 40-60% of equivalent electric heat at current energy prices in most US markets, making the fuel cost savings substantial at commercial scale. The breakeven point between electric and gas heating depends on your local electricity and gas rates, greenhouse insulation quality, and annual heating degree days for your climate. Reznor unit heaters are the commercial standard for large-bay greenhouse heating in North America.
