Roberts Hot Tubs
  • 510-234-7920
  • Robert’s Hot Tubs
    2343 Welcome Ave.
    Richmond, CA. 94804

Installation Preparation & Services

Proper hot tub installation preparation requires that you arrange for the following three items prior to installation.

  1. Proper Electrical Circuit
  2. Proper Sized Gas Line
  3. Cement Pads/Foundations for Hot Tub & Equipment

The following are the suggested specifications for installing an ACC controlled Hot Tub System.

Electrical Specifications
-20-amp 240v dedicated service for equipment with gas heater. – 20-amp 240v GFI breaker (for Controller; Gas heater; Pump; Ionizer) – (total amp draw = 9 – 10 Amps).

-40 Amp, 240volt dedicated service for equipment with 5.5kW electric heater. – 40-amp 240v GFI breaker (for Controller with 5.5kW electric heater; Pump; Ionizer) – (total amp draw = 31 – 33 Amps).
-60 Amp, 240volt dedicated service for equipment with 11kW Electric heater. – 60-amp 240v GFI breaker (for Controller with 11kW electric heater; Pump; Ionizer) – (total amp draw = 51 – 53 Amps).
-The dedicated electrical service requires a neutral wire, run in compliance with National Electric and/or Local building code, with enclosure for breakers at the equipment location.
-Electrical Services are required by National Electric Code (NEC) to be GFCI protected.
-If 2nd pump purchased, please contact us for appropriate breaker size for your system.

-20-amp 240v dedicated service for equipment. – 20-amp 240v GFI breaker (for Controller; Pump; Ionizer) – (total amp draw = 9 – 10 Amps).
-30-amp 240v dedicated service for heater (55k btu)

Gas Line Specifications
Our gas heater requires a gas line sufficient to supply 125k Btu’s of gas, run in compliance with National and/or Local building codes. Note: If an upgraded BTU gas heater is purchased, check with your plumber to ensure a properly sized gas line is installed.

PVC Plumbing Recommendation
If the length of run (distance) between the tub and equipment locations is five feet (5’) and up to forty feet (40’), Sch 40 – 2” PVC is recommended for the two lines In-fluent (from tub to equipment) and ex-fluent (from equipment back to tub jets/returns). Trenching of plumbing may be applicable. For runs longer than forty feet (40’), please give us a call.

Spa Side Control Recommendation
The Spa Side Control comes with a 15’ ribbon cable (longer upon request if needed) with male (PCB) and female (WiFi) connectors. If there is more than 5’ between the tub and your equipment, you will need to run electrical Grey 1” PVC conduit for fishing the ribbon cable through to protect it from burial effects or other environmental factors.

Cement Pad/Foundation Requirements for Tub & Equipment

As we mentioned earlier in the “Locating Your Tub and Equipment” section, you will need a concrete pad or foundations for the hot tub and a concrete pad or foundation for the hot tub equipment.

Our basic equipment package requires a concrete pad of 24″ by 48″, although it can be squeezed into a slightly smaller area if absolutely necessary.

If you must use a slightly smaller area, we recommend that you wait until you have the equipment in your possession prior to pouring your concrete pad.

The hot tub itself also requires a concrete pad or foundation to sit on. For stability and settling purposes, the tub itself should sit on a single solid concrete surface. Everything settles over time and just like the concrete slab under most homes, concrete settles but remains flat.

Tubs have successfully been installed on blocks, in gravel or on pier block foundations, but the settling process is much more likely to be uneven.

An uneven settling process can concentrate the stress on a single area of the tub causing premature cracks and leaks.

The minimum thickness safety requirement for a basic hot tub pad is 4″ thick reinforced concrete with a diameter of 6″ less than the diameter of the bottom of the tub. Therefore, a 5′ round straight sided wood hot tub would require a 4′ 6″ square pad.

The type of ground underneath the pad should be stable as well. If the soil has a propensity for expanding and contracting due to extreme freezing or scorching temperatures, you may be required to add concrete footings to stabilize the pad. Checking with a local contractor is an easy way to find out whether you need footings or not.

Sunken or semi-buried tubs have also become very popular and they are much easier to get in and out of.

A wooden hot tub easily be installed below grade with a few minor adjustments.

You will need to dig a pit large enough to accommodate the size of the concrete pad and build a retaining wall around the pad to keep excess dirt and debris from eroding and coming into contact with the tub itself. The retaining wall should be made of concrete, concrete block or ‘ground contact’ rated pressure treated wood.

Please make sure that you leave a minimum clearance of 12″, preferred clearance is 24″-36″, around the entire tub; a 5′ diameter tub requires a 7′ wide hole. This clearance allows you to pre-assemble the tub above the pit and then lower it into place.

Tub assembly requires a minimum of 24″ of total clearance around it for proper construction. You may also want to consider adding a sump pump in the pit depending on drainage and ground water.

Installing a hot tub on or in an existing deck is also quite popular, but most decks aren’t constructed to accommodate the weight of hot tub filled with water.

An average hot tub filled with water weighs in excess of 5000 lbs. before you and your friends jump in and we strongly advise hot tub owners considering tub installations on existing decking to check with a licensed engineer prior to beginning tub installation.