Quick overview: The table below summarizes seven 1500W-class heaters suitable for small greenhouses, grow tents, and sunrooms. Key distinctions include thermostat type, smart control, mounting options, and safety protections like overheat and tip-over shutdowns.
| Product | Key Feature | Ideal For |
|---|---|---|
| Greenhouse Heater with Digital Thermostat (Joanolga) | Digital thermostat, 2 modes | Small greenhouse, flower room |
| Greenhouse Heater with Thermostat (SOSUNLID) | Auto temperature control kit, fast heat | Grow tent, greenhouse up to ~120 sq ft |
| VEVOR Greenhouse Heater | PTC 3-second heating, IP20, ETL | Humid greenhouses, plant tents |
| DR Infrared DR-268 | Infrared heat, IPX5 water resistance | Indoor/outdoor greenhouse, shed, garage |
| 1500W Heater with APP Remote (SwSun) | Wi‑Fi smart control, alerts | Remote monitoring, large greenhouse setups |
| Buyplus 1500W Greenhouse Heater | Rapid 3s heating, digital thermostat | Grow tents, patios, small greenhouses |
| SEEYANG 1500W Outdoor Heater | PTC ceramic, whisper-quiet | Office-style greenhouse, workspaces |
Joanolga 1500W Greenhouse Heater
This unit delivers 5118 BTU / 1500W and is specified to warm areas up to ~150 ft². It includes two operational modes: fan-only (20W) and fan & heater (1500W), providing ventilation without heat when needed.
The heater ships with a detachable digital thermostat that supports an adjustable heating range from 40°F–108°F (5°C–42°C). Built-in overheat protection shuts the unit down if internal temperatures exceed safe limits. The manufacturer highlights low-noise operation suited to enclosed grow spaces.
SOSUNLID Auto Thermostat Heater
This kit pairs a 1500W heater with a dedicated digital thermostat to provide auto temperature control. The thermostat monitors ambient temperature and cycles the heater on/off to maintain setpoints, intended for greenhouses and grow tents.
Features include fast heating with a claimed 3-second start and adjustable fan speed for ventilation during warmer periods. The housing and controller are made with fireproof materials, and the heater includes independent overheat protection and a 15A-rated thermostat for reliable switching.
VEVOR PTC Fast Heating Heater
VEVOR’s unit uses PTC ceramic elements for 3-second rapid heating, designed to address humidity and poor air circulation in humid greenhouses. It outputs roughly 5100 BTU and operates with low noise for plant environments.
Construction uses alloy steel with an IP20 rating for protection against foreign objects, and the model is ETL certified with built-in overheat protection. Applications listed include chick brooding, plant tents, and greenhouse insulation.
DR Infrared DR-268 Greenhouse Heater
The DR-268 delivers clean infrared heat and is rated for indoor and outdoor use with an IPX5 / IP55 water resistance rating. The unit includes a corded sensor probe and a digital display for accurate temperature regulation.
Selectable Auto or Manual modes enable thermostatic or fixed-output operation. Multiple mounting options—wall, ceiling, or hanging—are provided to suit greenhouse layouts and directional heating needs.
SwSun Smart 1500W Heater With APP
SwSun integrates Wi‑Fi smart control so users can monitor and adjust greenhouse temperature remotely via an app. Real-time temperature display, high/low alarm alerts, and scheduled on/off are supported.
Safety features include overheat protection (auto-shutoff at 149°F / 65°C) and tip-over protection. The unit is positioned as a smart, portable heater for greenhouses, grow tents, garages, and sunrooms where remote monitoring is valuable.
Buyplus 1500W Digital Thermostat Heater
Buyplus’ model claims rapid 3-second heating and a heating capacity listed for spaces up to ~215 sq ft. A digital thermostat with a waterproof probe senses ambient temperature and permits a setting range from 40°F–108°F.
Built-in overheat protection with a self-resetting breaker is included to cut power at thermal thresholds. The product is described as suitable for patios, garages, grow tents, and small greenhouses.
SEEYANG 1500W PTC Ceramic Heater
SEEYANG uses PTC ceramic heating technology for fast warm-up—claimed to heat in ~2–3 seconds—with a 2600 RPM fan to distribute heat quickly and evenly. The design emphasizes energy efficiency and quiet operation (~35 dB).
It is intended for small indoor/outdoor spaces, with claims of up to ~215 sq ft coverage and a focus on low noise for work or relaxation spaces adjacent to plant areas.
Buying Guide
The sections below cover practical considerations when selecting a heater for a small greenhouse, comparing technologies, safety features, controls, and installation choices.
Heating Technology
- PTC Ceramic: Self-regulating ceramic elements heat rapidly and cool quickly, reducing sustained high internal temperatures. They are commonly used in greenhouse fan heaters for quick response and perceived safety.
- Infrared: Infrared heaters warm objects and plant surfaces directly rather than only heating air. This can reduce convective heat loss but may deliver less uniform air temperature if not positioned properly.
- Convection / Fan-Heaters: These circulate warm air and can help reduce humidity and cold spots by mixing room air. Fan speed levels assist in distribution and dehumidification.
Power, Coverage And BTU
1500W units are a common choice for small greenhouses and grow tents. Coverage depends on insulation, outdoor temperature, and greenhouse volume. Manufacturer coverage claims (e.g., 120–215 sq ft) are estimates; plan conservatively if insulation is minimal or temperatures are very low.
Thermostat And Control Options
- Built-in digital thermostats provide local temperature control and programming to maintain setpoints automatically.
- External corded probes allow sensor placement away from the heater to measure representative greenhouse air or canopy temperature.
- Smart (Wi‑Fi / App) control enables remote monitoring, alerts, and scheduling—useful for unattended sites or rapid response to temperature swings.
Safety Features
- Overheat protection (auto-shutoff) is essential to prevent internal component damage and reduce fire risk.
- Tip-over protection is important for freestanding units; it cuts power if the heater falls.
- Ingress / water resistance (IP ratings) matters in humid greenhouse conditions. Higher IP ratings (e.g., IPX5/IP55) provide better resistance to splashes.
Durability And Certification
Look for ETL/UL/CE certifications where applicable. Metal housings, corrosion-resistant coatings, and ratings against foreign object ingress (IP20, IPX5, etc.) influence long-term durability in humid or dirty greenhouse environments.
Mounting And Placement
- Wall or ceiling mount options focus heat into growing zones and keep heaters away from plant contact.
- Floor or portable units are easier to reposition but should be placed on stable, level surfaces and away from moisture.
- Consider sensor placement separate from the unit to avoid short-cycling or inaccurate readings caused by local heat near the heater.
Noise And Air Movement
Heaters with fans provide ventilation and distribution but produce noise. For work areas or seedling stages, choose models advertised as whisper-quiet or check decibel claims (~35 dB is quiet). Adjustable fan speeds allow balance between distribution and noise.
Climate And Insulation Considerations
Greenhouse characteristics strongly affect heater performance. Well-insulated small greenhouses require less power. In uninsulated or drafty structures, oversizing
Humidity, Dehumidification And Plant Health
In humid greenhouses, circulating heaters can help reduce condensation and fungal risk by moving air and warming surfaces. Infrared units warm plant surfaces and may be less effective at lowering ambient humidity unless paired with circulation.
Control Strategies And Redundancy
- Thermostatic control with hysteresis prevents short cycling; set reasonable differential values to avoid rapid on/off events.
- Consider dual sensing (air and canopy probes) for crops sensitive to root-zone vs. air temperatures.
- For critical crops, implement redundant alarms via smart heaters or separate monitoring to notify of system failures or power outages.
Comparison Snapshot
| Feature | Best For | Trade-offs |
|---|---|---|
| PTC Ceramic (VEVOR, SEEYANG) | Fast warm-up, safer thermal behavior | May rely on fan for distribution |
| Infrared (DR Infrared) | Direct canopy heating, outdoor-rated | Less uniform air temp unless paired with circulation |
| Smart Wi‑Fi (SwSun) | Remote monitoring/alerts | Requires network and configuration |
| Thermostat Kit (SOSUNLID, Joanolga, Buyplus) | Precise local control, simple installation | Wiring and probe placement affect accuracy |
Use the above factors—technology, thermostat type, safety protections, mounting, and greenhouse insulation—to match a heater’s capabilities to greenhouse size and crop sensitivity. Prioritize certified safety features and appropriate sensor placement to maintain stable growing conditions.
