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A crawl space is not an ordinary room, so a portable bedroom heater is not an acceptable substitute. The correct category is hardwired frost-protection equipment specifically approved for unclassified crawl spaces or pump houses. It is a small market: the five current models below are the purpose-built options; all need permanent, code-compliant installation by a licensed electrician and the clearance stated in their manuals.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Dimplex FP051TB Frost Protection Heater | $230–$300 | Amazon |
| 2 | Dimplex FP052TB Frost Protection Heater | $240–$320 | Amazon |
| 3 | Dimplex FP102TB Frost Protection Heater | $300–$400 | Amazon |
| 4 | TPI RPH1-5A Pump House Heater | $220–$300 | Amazon · eBay |
| 5 | TPI RPH2-5A Pump House Heater | $250–$340 | Amazon |
The picks, in detail
Dimplex FP051TB Frost Protection Heater
A 120V, 500W hardwired frost-protection heater specifically approved for crawl spaces and pump houses.
- 500W
- 120V
- built-in adjustable thermostat
- Designed for low-clearance frost protection
- Purpose-built crawl-space approval
- Hardwired installation is required
Dimplex FP052TB Frost Protection Heater
A 240/208V, 500/375W version for homes with the required higher-voltage circuit.
- 500W at 240V
- 208V compatible
- stainless tubular element
- Lower amperage on a 240V circuit
- Approved for crawl-space frost protection
- Requires 208/240V service
Dimplex FP102TB Frost Protection Heater
The higher-output 1000/750W Dimplex unit for larger cold equipment spaces that have a 240/208V circuit.
- 1000W at 240V
- 750W at 208V
- freeze-protection thermostat
- More output than the 500W versions
- Low-profile dedicated design
- Not a residential space-heating appliance
TPI RPH1-5A Pump House Heater
A 120V, 500W convection specialty heater for freeze protection in pump houses, utility rooms and crawl spaces.
- 500W 120V
- 30–140°F thermostat
- thermal-fuse overheat protection
- Manufacturer explicitly lists crawl-space use
- Compact 20-inch hardwired housing
- Must be mounted horizontally and off the floor
TPI RPH2-5A Pump House Heater
The 240/208V version of TPI’s compact RPH frost-protection heater for a dedicated higher-voltage circuit.
- 500W 240V or 375W 208V
- ETL-CUS listed
- thermal fuse
- Dedicated specialty-heater design
- Lower current draw on 240V
- Not usable on a standard 120V circuit
Buying tips
- Do not put a plug-in ceramic, infrared or oil-filled room heater under a house; its maker’s instructions do not approve that installation.
- First fix standing water, missing vapor barrier, unsealed penetrations and uninsulated pipes; a heater cannot make a wet, vented crawl space efficient.
- Use the required hardwired circuit, GFCI and clearance rules in the exact model manual; an electrician should size the circuit and location.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.