A dual-coil indirect water heater can connect to two separate heat sources, but the supplied product details do not confirm that any listed tank has two coils. The Crown Mega Stor and Burnham Alliance are the closest indirect-tank candidates; verify their coil configuration before buying. The aquastat is a control component, while the CAMPLUX and under-sink electric models are different types of water heaters rather than dual-coil indirect tanks.
| Product | Best suited for | Key point |
|---|---|---|
| Crown MS2-50 Mega Stor | Buyers considering a stainless-steel indirect tank | Stainless-steel tank and heat exchanger; coil count needs confirmation |
| Burnham AL35SL Alliance SL | Buyers considering a 35-gallon indirect-fired tank | Hydrastone-lined; coil count needs confirmation |
| Aquastat for Smart Indirect Water Heater | Buyers researching an indirect-heater control | Control accessory, not a water-heater tank |
| CAMPLUX propane tankless | Buyers comparing a separate on-demand system | Liquid propane, 2.64 GPM, 68,000 BTU |
| 110-volt under-sink electric heater | Buyers seeking a small point-of-use heater | 2.11-gallon capacity; not an indirect tank |
Crown MS2-50 Mega Stor
The Crown MS2-50 is a vertical indirect water heater and is the closest listed option for shoppers looking for a conventional indirect tank. Its listed features include a tank cylinder and heat exchanger made of 444 stainless steel, insulation designed to keep water hot during standby, and adjustable feet for uneven floors.
Best for: Buyers comparing indirect tanks who value the specified stainless-steel construction and adjustable feet. It was selected because its product name and features directly identify it as an indirect water heater.
Important limitation: The supplied details do not say whether it has two coils. Do not assume it is a dual-coil model; confirm the number and arrangement of heat exchangers with the seller or manufacturer before purchase.
Burnham AL35SL Alliance SL
The Burnham AL35SL is identified as a 35-gallon, Hydrastone-lined, indirect-fired water heater. Those details make it relevant to a buyer comparing indirect-fired tank options, but the listing information provided does not describe its coil count or connections.
Best for: Buyers who want to compare a specified 35-gallon indirect-fired model with other indirect tanks. It was selected because it is explicitly described as an indirect-fired water heater, unlike the tankless and under-sink alternatives in this list.
Important limitation: The product details do not confirm a dual-coil design. Check the manufacturer’s technical documentation for coil count, dimensions, connection locations, and installation requirements before treating it as a match for a two-source system.
Aquastat For Smart Indirect Water Heater
This listing is for an aquastat described as a commercial 194°F control for a smart indirect water heater. An aquastat is a control component, not a water-storage tank, so it cannot serve as a standalone dual-coil water heater.
Best for: Buyers researching a replacement or control component for an indirect-water-heater setup. It was included because it is specifically associated with an indirect water heater, although the provided details are limited.
Important limitation: The supplied information does not specify compatibility, wiring, sensing method, or whether the control suits a particular tank or boiler. Confirm those requirements with the equipment documentation or a qualified installer before ordering.
CAMPLUX Propane Tankless Heater
The CAMPLUX listing describes an indoor liquid-propane tankless water heater rated at 2.64 GPM and 68,000 BTU. It is a separate on-demand heating option, not an indirect storage tank and not a dual-coil product.
Best for: Buyers comparing a propane tankless system with an indirect tank as a different equipment category. The stated flow rate and BTU input provide concrete specifications to evaluate for that comparison.
Important limitation: The listing does not provide enough information here to establish whether its flow rate meets a particular household’s simultaneous hot-water demand. It also does not establish compatibility with an indirect-heater or dual-coil arrangement.
110-Volt Under-Sink Electric Heater
This compact electric model is described as a 110-volt, 1,500-watt, 2.11-gallon under-sink heater. The listing also states a maximum temperature of 149°F and an IPX4 rating. It is a point-of-use electric appliance, not an indirect tank or dual-coil heater.
Best for: Buyers seeking a small under-sink hot-water option and comparing it with whole-system equipment. It was selected as a clearly specified alternative, not as a direct substitute for a central indirect water heater.
Important limitation: Its listed capacity is small compared with a household storage tank. The supplied information does not establish how much hot water it can provide for a specific faucet or use pattern.
Buying Guide: How To Choose A Dual Coil Indirect Water Heater
What does “dual coil” mean?
A dual-coil indirect water heater has two heat-exchanger coils inside a storage tank. The two coils can allow heat to transfer from separate sources or circuits, depending on the tank design and system controls. The exact intended arrangement varies by installation, so buyers should check the manufacturer’s piping diagram rather than relying on a product title alone.
In the listings reviewed here, neither indirect tank’s supplied features confirm two coils. The Crown listing describes a stainless-steel tank and heat exchanger, while the Burnham listing describes a 35-gallon Hydrastone-lined indirect-fired tank. Neither description establishes that it is dual-coil.
How can you verify the coil count?
Look for a manufacturer’s specification sheet that states the number of heat exchangers or coils. Review the piping diagram and connection labels, and ask the seller or manufacturer to confirm the exact model number. Do not infer coil count from “indirect,” “indirect-fired,” or “heat exchanger” by itself.
- Confirm the tank has two separate coils if two heat sources are required.
- Check the location and purpose of each coil connection in the manufacturer’s diagram.
- Confirm tank capacity, dimensions, and required clearances against the installation space.
- Have a qualified professional check that the proposed tank and controls suit the boiler and plumbing system.
Should you choose stainless steel or a lined tank?
The Crown product listing specifies 444 stainless steel for both the tank cylinder and heat exchanger. The Burnham product name specifies a Hydrastone lining. These are different construction descriptions, but the supplied details do not provide enough information to compare service life, maintenance, or performance. Consult the manufacturer’s documentation for material-specific care and system requirements.
Is an aquastat part of the tank?
No. The listed aquastat is a control component, not a water heater. A control can be relevant to managing an indirect system, but buyers should verify its electrical and equipment compatibility. The provided listing details do not identify which tanks or boiler systems it supports.
When is a different type of heater a better fit?
A propane tankless heater and a small under-sink electric heater address different needs from a dual-coil indirect tank. The CAMPLUX model is listed as a 2.64 GPM, 68,000 BTU liquid-propane tankless heater. The electric model is listed as a 2.11-gallon, 110-volt point-of-use heater. Compare them only if you are open to a different system type and confirm the relevant installation and demand requirements.
What should you ask before ordering?
- Does the exact model have two coils, and can the manufacturer provide a diagram?
- What are the tank capacity, physical dimensions, and connection specifications?
- Which heat sources and controls are intended to connect to each coil?
- Does the selected control match the heater and system wiring?
- What installation requirements apply to the home’s existing equipment?
Frequently Asked Questions
Are the Crown MS2-50 and Burnham AL35SL confirmed dual-coil heaters?
No. The supplied details identify them as indirect water heaters but do not confirm two coils. Verify the exact model using manufacturer documentation before purchasing for a dual-source setup.
Can an aquastat replace an indirect water heater?
No. An aquastat is a control component. It does not store or heat water by itself.
Is a tankless propane heater an indirect water heater?
No. The CAMPLUX listing describes a liquid-propane tankless heater. It is a separate type of water-heating system and is not a dual-coil storage tank.
Is the 2.11-gallon electric heater suitable as a whole-house tank?
The listing describes it as an under-sink point-of-use heater with a 2.11-gallon capacity. The supplied information does not support treating it as a whole-house storage tank.
What is the most important check when shopping for a dual-coil model?
Confirm that the exact tank model has two distinct coils, and review its manufacturer piping diagram. A general description as an indirect heater does not establish dual-coil construction.